20以内进位加法退位减法

1、(1)18 - 8 =(21)14 - 4 =(41)19 - 9 = 1(2) 19 - 9 =(22)14 - 8 =(42)14 - 5 = 1(3) 17 - 9 =(23)14 - 6 =(43)19 - 9 = 1(4) 19 - 9 =(24)12 - 7 =(44)17 - 9 =丨(5) 14 - 6 =(25)17 - 7 =(45)15 - 8 = 1(6) 17 - 8 =(26)15 - 6 =(46)15 - 6 = 1(7) 11 - 1 =(27)11 - 6 =(47)16 - 6 =丨(8) 12 - 7 =(28)11 - 7 =(48)11 - 9 =

2、1(9) 17 - 9 =(29)17 - 9 =(49)11 - 5 = 1(10) 13-3=1(30)13 - 3 =(50)14 - 7 = 1(11) 14 - 5 =1(31)19 - 9 =(51)13 - 8 =丨(12) 11 - 8 =1(32)13 - 8 =(52)16 - 9 = 1(13) 18-8=(33)12 - 4 =(53)19 - 9 = 1(14) 17 - 8 =1(34)16 - 9 =(54)18 - 8 = 1(15) 18-8=1(35)17 - 7 =(55)14 - 7 = 1(16) 13 - 3 =1(36)15 - 5 =(56)17

3、 - 7 = 1(17) 15-7 =(37)17 - 8 =(57)11 - 3 = 1(18) 16 -6 =1(38)19 - 9 =(58)14 - 6 = 1(19) 13-7=1(39)13 - 6 =(59)15 - 6 = 1(20) 12 - 9 =1(40)14 - 5 =(60)18 - 8 = 1(1)5 + 7 =(21)5 + 8 =(41)9 + 1 = f(18)4 + 8 = I(38)4 + 8 =(58)2 + 9 = f(19)3 + 7 =(39)6 + 9 =(59)1 + 9 =(20)1 + 9 =(40)9 + 7 =(60)6 + 8 =(1

4、0)(11)(12)(13)(14)(15)(16)(17)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(42)(43)(44)(45)(46)(47)(48)(49)(50)(51)(52)(53)(54)(55)(56)(57)7 + 6 = f(21)19 + 1 = f(41)15 + 3 = f(18)1 + 11 =(38)5 + 10 =(58)19 + 1 =(19)9 + 6 =(39)15 + 4 =(59)11 + 5 =(20)10 + 2 = f(40)19 + 1 =(60)16 +

5、 1 =17 + 1 =12 + 3 =10 + 6 =15 + 5 =2 + 12 =14 + 2 =16 + 3 =(22)(23)(24)(25)(26)(27)(28)(29)9 + 10 =19 + 1 =(10)5 + 14 =(30)(11)15 + 1 = I(31)13 + 7 = I(12)7 + 11 = I(32)4 + 13 =(13)11 + 9 = I(33)17 + 1 =(14)18 + 2 =(34)(15)10 + 2 = I(35)(16)11 + 9 = I(36)12 + 5 = I(17)(37)12 + 5 =(42)(43)(44)(45)(4

6、6)(47)(48)(49)(50)(51)(52)(53)(54)(55)(56)(57)13 + 5 = I18 + 1 =2 + 11 =4 + 13 =16 + 2 = I16 + 2 =(1) 17-8 =1(21)16 - 9 = 1(41)17 - 8 =(2) 13 - 8 =(22)16 - 8 = 1(42)12 - 5 =(3) 15 - 5 =(23)15 - 8 =丨(43)14 - 4 =(4) 13 - 4 =(24)14 - 6 =丨(44)16 - 6 =(5) 15 - 6 =(25)17 - 8 = 1(45)13 - 7 =(6) 16 - 7 =(26

7、)19 - 9 = 1(46)16 - 8 =(7) 14 - 7 =(27)16 - 6 = 1(47)15 - 5 =(8) 16 - 8 =(28)16 - 8 = 1(48)16 - 6 =(9) 16 - 9 =(29)15 - 9 = 1(49)16 - 9 =(10) 18-9=:|(30)18 - 9 = 1(50)18 - 8 =(11) 15 -9 =:|(31)13 - 5 = 1(51)13 - 3 =(12) 12 -6 =1(32)13 - 6 = 1(52)11 - 7 =(13) 12 -3 =1(33)15 - 9 = 1(53)15 - 9 =(14) 19

8、 -9 =:|(34)18 - 9 = 1(54)11 - 2 =(15) 17 -9 =:|(35)16 - 7 = 1(55)13 - 9 =(16) 17 -9 =:|(36)15 - 9 = 1(56)12 - 9 =(17) 17 -9 =:|(37)19 - 9 = 1(57)15 - 6 =(18) 16 -9 =1(38)17 - 9 = 1(58)11 - 1 =(19) 12 -6 =:|(39)15 - 9 = 1(59)12 - 5 =(20) 18 -9 =:|(40)14 - 8 = 1(60)11 - 2 =12 + 6 =(21)9 + 5 = f(41)8 +

9、 6 = f(18)1 + 10 =(38)16 + 1 =(58)1 + 17 =(19)6 + 1 =(39)12 + 1 =(59)14 + 1 = I(20)17 + 2 =(40)13 + 6 =(60)8 + 1 = f(22)(42)13 + 4 =10 + 8 =8 + 12 =1 + 15 =(10)3 + 14 =(11)11 + 8 = I(12)(13)17 + 2 = I(14)16 + 3 =(15)(16)(17)7 + 13 =(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)3 + 13 =

10、 f16 + 4 = f2 + 12 =14 + 3 = f10 + 10 =19 + 1 = f13 + 3 =17 + 2 = I5 + 12 =16 + 1 =15 + 1 = I9 + 10 =(43)(44)(45)(46)(47)(48)(49)(50)(51)(52)(53)(54)(55)(56)(57)18 + 1 =13 + 6 = I11 + 5 =13 + 7 = I(1)19 - 9 = f(21)14 - 6 = f(41)12 - 3 = f(18)14 - 7 = I(38)14 - 9 =(58)15 - 9 =(19)14 - 9 =(39)16 - 6 =

11、(59)12 - 9 = I(20)14 - 4 =(40)19 - 9 = f(60)11 - 1 = f(22)(42)(23)(43)(24)(44)(25)(45)16 - 8 =13 - 9 =(26)19 - 9 =(46)16 - 6 =(27)(47)(28)(48)(29)(49)16 - 8 = f(10)15 - 8 =(30)14 - 8 =(50)(11)19 - 9 = I(31)18 - 8 = I(51)(12)19 - 9 =(32)14 - 7 =(52)12 - 8 =(13)(33)18 - 9 = I(53)19 - 9 = I(14)12 - 6 =

12、(34)11 - 7 =(54)14 - 7 =(15)12 - 3 =(35)19 - 9 = I(55)16 - 8 =(16)14 - 7 = I(36)13 - 6 = I(56)12 - 2 =(17)16 - 7 =(37)(57)15 - 9 =(1)13 + 3 = 1(21)8 + 11 = 1(41)11 + 5 = 1(2)4 + 7 =(22)9 + 2 =(42)14 + 2 =(3)仃 + 2 = 1(23)19 + 1 =(43)10 + 9 =(4)19 + 1 = 1(24)5 + 8 =(44)14 + 4 =(5)16 + 3 = 1(25)3 + 3 =

13、 1(45)1 + 17 = 1(6)7 + 3 =(26)13 + 2 =(46)11 + 8 =(7)6 + 7 =(27)11 + 8 =(47)3 + 1 =(8)6 + 10 = 1(28)17 + 2 =(48)1 + 5 =(9)17 + 2 =(29)17 + 1 =(49)10 + 4 =(10)6 + 14 =丨(30)18 + 1 =(50)13 + 2 =(11)4 + 12 =丨(31)10 + 10 =(51)11 + 5 =(12)16 + 3 =丨(32)10 + 7 =(52)18 + 1 =(13)18 + 1 = 1(33)13 + 3 =(53)1 +

14、8 =(14)14 + 1 =丨(34)14 + 5 =(54)12 + 7 =(15)19 + 1 =丨(35)15 + 1 =(55)15 + 3 =(16)10 + 9 = 1(36)11 + 7 =(56)3 + 12 =(17)2 + 8 = 1(37)14 + 4 = 1(57)16 + 2 = 1(18)15 + 5 =)(38)13 + 5 = 1(58)12 + 6 = 1(19)10 + 4 =(39)17 + 3 =(59)13 + 6 =(20)3 + 12 =(40)10 + 4 =(60)15 + 4 =1(21) 14 - 9 = 11(41) 12 - 4 =

15、1(22) 19 - 9 =(42) 16 - 6 =(23) 14 - 7 =(43) 12 - 9 =(24) 12 - 6 =(44) 15 - 5 =)(25) 14 - 9 = 11(45) 19 - 9 = 1(26) 16 - 9 =(46)仃-8 =(27)仃-7 =(47) 13 - 6 =17 - 9 =15 - 6 =13 - 7 =16 - 9 =18 - 8 =18 - 8 = f13 - 3 = f(28)(48)17 - 8 =15 - 6 =15 - 7 =(29)14 - 9 = f(49)12 - 6 = f(10)14 - 7 =(30)12 - 7 =

16、f(50)16 - 9 = f(11)15 - 7 =(31)13 - 8 = I(51)16 - 7 = I(12)18 - 8 =(32)19 - 9 = I(52)11 - 6 = I(13)12 - 9 = f(33)11 - 6 = I(53)(14)11 - 9 =11 - 1 =(34)15 - 7 = f(54)12 - 6 = f(35)15 - 5 = I(55)15 - 5 = I(16)19 - 9 =(36)11 - 2 = I(56)18 - 9 = I(17)(37)(57)19 - 9 = I(19) 13-8=(39) 16 - 8 =(59) 18 - 9

17、=(20) 16 -9 =(40) 16 - 9 =(60)仃-7 =13 - 4 = I(18)(38)(58)13 - 8 = f仃-7 = f(1) 3 + 13 = 1(21)10 + 3 = 1(41)11 + 9 = 1(2)仃 + 3 = 1(22 )3 + 10 = 1(42)12 + 4 = 1(3) 5 + 11 = 1(23 )11 + 6 =丨(43)12 + 8 = 1(4) 11 + 9 = 1(24 )10 + 3 = 1(44)10 + 7 = 1(5) 15 + 5 = 1(25 )13 + 6 =丨(45)14 + 2 = 1(6) 1 + 7 =(26 )

18、9 + 6 =丨(46)14 + 6 = 1(7 ) 12 + 2 = 1(27 )11 + 7 =丨(47)13 + 2 = 1(8 ) 9 + 11 = 1(28 )3 + 10 =丨(48)7 + 2 =(9 ) 4 + 5 =(29 )仃 + 3 = 1(49)4 + 9 =(10 ) 12 + 1 = 1(30 )9 + 5 = 1(50)11 + 3 = 1(11) 18 + 1 = 1(31)8 + 11 =丨(51)9 + 5 =(12) 11 + 2 = 1(32 )15 + 3 = 1(52)15 + 4 = 1(13 ) 7 + 12 = 1(33 )9 + 8 = 1(

19、53)9 + 11 = 1(14 ) 7 + 1 = 1(34 )8 + 4 = 1(54)9 + 3 =(15) 6 + 3 = 1(35 )6 + 5 = 1(55)8 + 1 =(16) 14 + 4 = 1(36 )8 + 10 =丨(56)15 + 5 = 1(17) 9 + 5 = 1(37 )16 + 1 = 1(57)11 + 6 = 1(18 ) 5 + 14 = 1(38 )7 + 5 = 1(58)7 + 10 = 1(19 ) 7 + 13 = 1(39 )18 + 1 = 1(59)3 + 10 = 1(20 ) 7 + 1 = 1(40 )14 + 2 = 1(60

20、)9 + 5 =(1) 14 - 4 =(21)11 - 2 =(41)仃-7 = 1(2) 13 - 4 =(22)12 - 9 =(42)19 - 9 = 1(3) 19 - 9 =(23)11 - 5 =(43)11 - 2 =丨(4) 17 - 7 =(24)19 - 9 =(44)14 - 7 =丨(5) 19 - 9 =(25)12 - 4 =(45)14 - 5 = 1(6) 11 - 3 =(26)19 - 9 =(46)11 - 6 = 1(7) 12 - 7 =(27)15 - 7 =(47)11 - 8 =丨(8) 11 - 4 =(28)15 - 9 =(48)11 -

21、 8 = 1(9) 16 - 8 =(29)13 - 4 =(49)12 - 8 = 1(10) 16 -6 =1(30)13 - 9 =(50)仃-7 = 1(11) 16 - 9 =1(31)11 - 3 =(51)11 - 9 =丨(12) 13 - 4 =1(32)13 - 6 =(52)15 - 6 = 1(13) 11 - 8 =(33)16 - 8 =(53)18 - 9 = 1(14) 11 - 7 =1(34)17 - 9 =(54)14 - 4 = 1(15) 13-8=1(35)14 - 8 =(55)16 - 8 = 1(16) 14 - 9 =1(36)13 - 4

22、=(56)12 - 9 = 1(17) 13-5=(37)16 - 8 =(57)11 - 4 = 1(18) 14 - 9 =1(38)17 - 8 =(58)11 - 7 = 1(19) 19-9=1(39)15 - 8 =(59)15 - 7 = 1(20) 12 - 5 =1(40)14 - 9 =(60)13 - 8 = 112 + 8 = f(21)(41)6 + 11 = f(22)(42)10 + 1 = f(23)(43)(24)(44)(25)(45)12 + 4 = f13 + 7 = f(10)6 + 13 =(11)11 + 1 = I(12)10 + 6 =(13)

23、12 + 5 = I(14)18 + 1 =(15)11 + 9 =(16)3 + 14 = I(17)11 + 2 =(18)(19)6 + 12 =(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(46)3 + 15 =18 + 1 =17 + 1 = I18 + 1 =2 + 18 = I13 + 6 =5 + 15 = I12 + 7 =(47)(48)(49)(50)(51)(52)(53)(54)(55)(56)(57)(58)(59)16 + 1 =12 + 4 =10 + 3 = I19 + 1 =16 + 3 =

24、 I18 + 2 =14 + 6 =12 + 7 =(20)6 + 3 = f(40)11 + 1 =(60)16 + 4 =(1) 18-9 =1(21)13 - 6 = 1(41)14 - 6 = 1(2) 18 - 8 =(22)16 - 8 = 1(42)12 - 7 =(3) 19 - 9 =(23)17 - 8 = 1(43)14 - 4 = 1(4) 14 - 5 =(24)19 - 9 = 1(44)仃-7 = 1(5) 17 - 9 =(25)17 - 9 = 1(45)13 - 8 =(6) 12 - 8 =(26)17 - 9 = 1(46)16 - 9 =(7) 15

25、- 8 =(27)15 - 6 = 1(47)19 - 9 = 1(8) 19 - 9 =(28)14 - 8 = 1(48)15 - 5 = 1(9) 15 - 7 =(29)11 - 1 =1(49)11 - 4 =(10) 14 -5 =:1(30)15 - 6 = 1(50)11 - 9 = 1(11) 11 -9 =:|(31)16 - 7 = 1(51)15 - 8 =(12) 11 -7 =1(32)16 - 9 = 1(52)14 - 4 =(13) 18 -9 =1(33)13 - 5 = 1(53)18 - 8 = 1(14) 13-6=:|(34)17 - 8 = 1(5

26、4)18 - 9 =(15) 16 -7 =:|(35)19 - 9 = 1(55)15 - 6 =(16) 15-5 =:|(36)12 - 4 = 1(56)13 - 4 =(17) 11 -5 =:|(37)19 - 9 = 1(57)18 - 8 = 1(18) 12 -8 =:|(38)13 - 8 = 1(58)16 - 6 =(19) 17 -8 =:|(39)16 - 8 = 1(59)16 - 9 = 1(20) 18 -9 =:|(40)12 - 5 = 1(60)仃-8 = 1(1) 2 + 13 = 1(21)17 + 1 =丨(41)5 + 2 =(2) 4 + 14

27、 = 1(22 )14 + 1 = 1(42)19 + 1 = 1(3) 16 + 2 = 1(23 )1 + 14 =丨(43)13 + 5 = 1(4)仃 + 1 = 1(24 )3 + 7 =丨(44)1 + 8 = 1(5) 1 + 13= 1(25 )16 + 1 = 1(45)12 + 6 = 1(6) 7 + 9 =(26 )6 + 13 =丨(46)11 + 6 = 1(7) 18 + 1 = 1(27 )5 + 14 =丨(47)17 + 1 = 1(8 ) 16 + 1 = 1(28 )14 + 2 =丨(48)10 + 5 = 1(9 ) 2 + 1 =(29 )7 +

28、7 =丨(49)13 + 3 = 1(10) 15 + 2 = 1(30 )17 + 2 = 1(50)9 + 10 = 1(11) 5 + 5 = 1(31)14 + 1 =丨(51)15 + 3 = 1(12) 2 + 13 = 1(32 )16 + 2 = 1(52)5 + 1 =(13 ) 11 + 2 = 1(33 )3 + 3 = 1(53)18 + 1 = 1(14) 10 + 3 = 1(34 )1 + 14 = 1(54)4 + 10 = 1(15) 6 + 9 = 1(35 )14 + 6 = 1(55)19 + 1 = 1(16) 15 + 1 = 1(36 )7 + 6

29、 = 1(56)13 + 3 = 1(17 ) 3 + 4 = 1(37 )14 + 1 = 1(57)10 + 9 = 1(18) 6 + 2 = 1(38 )11 + 9 = 1(58)17 + 3 = 1(19 ) 19 + 1 = 1(39 )3 + 7 = 1(59)2 + 7 = 1(20 ) 14 + 2 = 1(40 )8 + 7 = 1(60)16 + 2 = 1(1) 12 - 5 =(21)15 - 6 = 1(41)11 - 5 = 1(2) 12 - 2 =(22)14 - 8 =丨(42)15 - 5 = 1(3) 17 - 8 =(23)11 - 2 = 1(43

30、)17 - 7 = 1(4) 15 - 7 =(24)18 - 8 =丨(44)19 - 9 = 1(5) 13 - 9 =(25)14 - 4 = 1(45)15 - 7 = 1(6) 18 - 9 =(26)19 - 9 = 1(46)16 - 6 = 1(7) 12 - 8 =(27)16 - 9 =丨(47)17 - 7 =丨(8) 15 - 9 =(28)13 - 5 = 1(48)18 - 8 = 1(9) 16 - 6 =(29)12 - 8 = 1(49)16 - 8 = 1(10) 12 - 7 =1(30)11 - 9 = 1(50)16 - 7 = 1(11) 17 -

31、8 =1(31)19 - 9 =丨(51)17 - 9 = 1(12) 15 - 7 =1(32)15 - 9 = 1(52)16 - 7 = 1(13) 12 - 5 =(33)16 - 7 = 1(53)19 - 9 = 1(14) 14 - 5 =1(34)16 - 9 = 1(54)17 - 7 = 1(15) 12 - 2 =1(35)14 - 9 = 1(55)11 - 7 = 1(16) 15 - 6 =1(36)14 - 8 = 1(56)15 - 8 = 1(17) 17 - 7 =(37)16 - 9 = 1(57)19 - 9 = 1(18) 14 - 5 =1(38)1

32、6 - 9 = 1(58)17 - 9 = 1(19) 11 - 9 =1(39)12 - 3 = 1(59)16 - 8 = 1(20) 17 -8 =1(40)16 - 7 = 1(60)11 - 9 = 1(1) 13 + 4 =(21) 11 + 7 =1(41) 15 + 2 = 1(2) 10 + 4 =(22) 10 +4 =1(42) 8 + 2 = 1(3) 13 + 1 =(23) 13 + 3=1(43) 10 + 9 = 1(4) 9 + 7 =厂(24) 13 + 3=1(44) 14 + 5 = 1(5) 8 + 10 =(25) 5 + 7 = 1(45) 8 +

33、 2 = 1(6) 10 + 8 =(26) 10 + 2 =1(46) 9 + 1 = 1(7) 3 + 17 =(27) 7 + 12 =1(47) 1 + 18 = 1(8) 5 + 15 =(28) 3 + 4 = 1(48) 14 + 5 = 1(9) 16 + 3 =(29) 9 + 1 = 1(49) 13 + 5 = 1(10) 1 + 4 = 1(30) 1 + 3 = 1(50) 12 + 2 = 1(11) 5 + 6 = 1(31) 13 + 3 =1(51) 3 + 1 = 1(12) 7 + 3 = 1(32) 1 + 12 =1(52) 6 + 11 = 1(13

34、) 9 + 1 = 1(33) 7 + 7 = 1(53) 7 + 5 = 1(14) 18 + 1 =1(34) 4 + 11 =1(54) 2 + 8 = 1(15) 9 + 3 = 1(35) 3 + 7 = 1(55) 19 + 1 = 1(16) 15 + 1 =1(36) 14 +1 =1(56) 10 + 10 = 1(17) 16 + 4 =1(37) 3 + 2 = 1(57) 14 + 3 = 1(18) 13 + 4 =1(38) 1 + 5 = 1(58) 5 + 14 = 1(19) 17 + 3 =1(39) 15 +4 =1(59) 18 + 1 = 1(20)

35、19 + 1 =1(40) 10 + 8=1(60) 5 + 6 = 1(2) 13-8 =(22) 15 - 9 =(42) 14 - 5 =(3) 18 - 8 =(23) 12 - 6 =(43) 17 - 7 =(4) 16 -9 =(24) 12 - 3 =(44) 17 - 9 =(5) 18 - 8 =1(25) 14 - 4 =1(45) 17 - 9 = 1(6) 19 - 9 =(26) 18 - 9 =(46) 16 - 9 =(7) 16 - 9 =(27) 15 - 7 =(47) 18 - 9 =(8) 14 - 8 =(28) 15 - 6 =(48) 15 -

36、5 =(9) 18 - 9 =(29) 12 - 2 =(49) 15 - 8 = 117 - 8 = f15 - 7 = f13 - 8 = f(21)(41)(10)(30)(50)13 - 3 =19 - 9 =15 - 8 =(19) 11 -2 =(39) 12 - 3 =(59) 13 - 6 =(20) 19 -9 =(40) 12 - 8 =(60) 18 - 9 =18 - 8 = I(18)(38)(58)15 - 8 = f19 - 9 = f(11)17 - 7 =(31)13 - 3 =(51)12 - 8 =(12)16 - 6 =(32)15 - 6 =(52)1

37、3 - 8 =(13)12 - 2 =(33)12 - 8 =(53)14 - 5 = f(14)11 - 9 =(34)13 - 7 =(54)14 - 4 =(15)11 - 9 =(35)17 - 9 =(55)19 - 9 =(16)14 - 7 =(36)13 - 4 =(56)17 - 8 =(17)(37)(57)(1)(21)4 + 16 = f(41)15 + 5 =7 + 12 =6 + 10 = f10 + 4 =(10)2 + 11 =(11)13 + 2 = I(12)18 + 2 =(13)13 + 6 = I(14)(15)11 + 6 =(16)(17)(18)

38、4 + 15 =(19)5 + 13 =(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35)(36)(37)(38)(39)19 + 1 =17 + 1 =10 + 7 = I3 + 12 =12 + 8 =10 + 2 = I11 + 6 =19 + 1 =(42)(43)(44)(45)(46)(47)(48)(49)(50)(51)(52)(53)(54)(55)(56)(57)(58)(59)19 + 1 =13 + 7 = f3 + 10 =17 + 3 =19 + 1 =2 + 11 =19 + 1 =5 + 10 =19

39、 + 1 =19 + 1 =(20)2 + 18 =(40)16 + 1 =(60)10 + 2 =(1) 15 - 9 =(21)19 - 9 =(41)14 - 6 = 1(2) 16 - 7 =(22)19 - 9 =(42)16 - 9 = 1(3) 16 - 6 =(23)12 - 7 =(43)17 - 9 = 1(4) 12 - 3 =(24)15 - 9 =(44)18 - 8 = 1(5) 15 - 9 =(25)15 - 8 =(45)12 - 3 = 1(6) 18 - 8 =(26)19 - 9 =(46)16 - 7 = 1(7) 15 - 7 =(27)13 - 3

40、 =(47)11 - 9 = 1(8) 18 - 9 =(28)14 - 6 =(48)17 - 9 = 1(9) 16 - 8 =(29)14 - 5 =(49)13 - 5 = 1(10) 11 - 5 =1(30)15 - 9 =(50)16 - 9 = 1(11) 19 - 9 =1(31)11 - 4 =(51)12 - 7 = 1(12) 17 - 9 =1(32)14 - 8 =(52)18 - 8 = 1(13) 18 - 8 =(33)18 - 8 =(53)19 - 9 = 1(14) 11 - 9 =1(34)12 - 7 =(54)17 - 7 = 1(15) 13 -

41、 6 =1(35)13 - 4 =(55)16 - 6 = 1(16) 12 - 6 =1(36)16 - 9 =(56)13 - 3 = 1(17) 17 - 7 =(37)14 - 6 =(57)19 - 9 = 1(18) 11 - 7 =1(38)19 - 9 =(58)15 - 7 = 1(19) 18 - 9 =1(39)19 - 9 =(59)15 - 8 = 1(20) 11 - 9 =1(40)14 - 5 =(60)16 - 8 = 1(1)18 + 2 =(21)13 + 4 = 1(41)5 + 13 = 1(2)12 + 7 =(22)14 + 4 = 1(42)5 +