20以内加减法练习题好用直接打印版

1、20以内加减法口算练习题（一）姓名：时间： 做对了 题（共80题）10 + 8 =10+2 =13 + 2 =8+2+3=8+ 10 =177 =19 3 =9+1+4=18 8 =10+8 =3+ 11 =7+3+5=18-10 =3 + 10 =16 4 =7+4+6=10 + 1 =10+2 =19 4 =7+8+3=1 + 10 =10 + 10 =19 5 =6+4+7=11 -1 =144 =15 3 =8+2+5=11 10 =18 8 =10 + 4 =5 + 4 + 6 =6+ 10 =6 + 10 =13 3 =7+2+3=16 6 =10+9 =14-1 =3 + 4 +

2、 10 =16-10 =8 + 10 =10 + 2 =11 - 1 5 =10 + 3 =133 =13 3 =17 7 3 =3+ 10 =5 + 10 =3+ 15 =19-9 + 1 =13 3 =16-10 =18 8 =15 5 7 =13-10 =11 10 =5+5 =13 3 4 =10 + 5 =13-10 =4+ 6 =18-10-4 =5+ 10 =18-10 =20-20 =17-10-7 =10 + 8 =10-10 =12 + 4 =14-10+5 =3+ 10 =10+9 =88 =16-10+3 =11 -1 =105 =10 + 0 =20-10-7 =精选

3、20以内加减法练习题（二）姓名： 时间： 做对了 题（共100题）9+1 =8 + 7 =8 + 4 =9 + 7 =9+7 =8 + 2 =7 + 9 =8 + 5 =6 + 6 =6+5 =8 + 3 =7 + 5 =9 + 6 =4 + 9 =2+8 =2 + 9 =8 + 6 =6 + 8 =6 + 5 =7+7 =19 9 =8 + 8 =7 + 9 =5 + 8 =8+8 =9+3 =7 + 4 =8+10 =5 + 7 =4+8 =8 + 4 =8 + 5 =7 + 4 =8 + 7 =8+6 =5+9 =7 + 7 =5 + 7 =4 + 8 =7+6 =8 + 6 =6 +

4、5 =9 + 2 =8 + 6 =3 + 9 =4+9 =1+9=7 + 8 =7+10=5 + 9=5+9 =7 + 3 =9 + 8 =2 + 8 =3 + 8 =6+ 9 =6 + 7 =9 + 2 =10 9 =6+ 4 =7+9 =5 + 6 =8 + 3 =2+10 =7+2 =8 + 9=8 5 =6 + 7 =9+8 =6+ 9 =9+0 =10-7 =8 + 4 =6 + 3 =6 + 8 =5+8 =6 + 7 =1+9 =10 + 4 =5+ 10 =8 + 9 =2 + 9 =105 =6 + 8 =13 3 =9+9 =9 + 4 =9 + 5 =9 + 3 =3+8

5、 =9+3 =5 + 9 =8 + 2 =7 + 4 =6+7 =3+8 =9+5 =9 + 3 =8 + 3 =5-4 =精选20以内加减法练习题（三）姓名： 时间：_ 做对了 题（共80题）8 + 9 =9 + 8 =7 + 6 =7 + 5 =6+2+7=10 + 8 =8 + 5 =9 + 6 =6 + 9 =4+5+2=5+5 =9 + 5 =7 + 8 =9 + 5 =3+5+7=4 + 6 =5 + 9 =6 + 7 =7 + 7 =4+ 4+ 6 =9 + 4=8+4=9 + 7=9 + 4=4+3+2=7 + 4 =6 + 5 =8 + 6 =7 + 8 =4+6+58 +

6、4 =6 + 6 =6 + 8 =9 + 6 =7 2 410-2 =7+7 =8+5 =8 + 3 =2+6+5=2 + 9 =9 + 7 =5 + 8 =7 + 4 =7+1+7=7+5 =8 + 8 =8 + 4=9 + 9=6+3+4=18-2 =9 + 2 =4 + 8 =8 + 4 =6+1+5=10 + 5 =5 + 7 =9 - 4 =7 + 6 =5+2+4=9 + 6=9 + 5 =7 + 6 =9 + 4 =3+5+9=8 + 4 =7 + 9 =6 + 7 =6 + 8 =6+4+1=9 + 4 =8+10 =7 + 5 =7 + 9 =3+ 6+ 5 =8+7 =6+

7、10 =5 + 7 =9 + 8 =7+2+6=9 + 2 =8 + 6 =4 + 7 =9 + 3 =4+4+9=7+5 =19 7 =7 + 4 =8 + 4 =9+1+9=7+9 =7 + 3 =9 + 3 =8 + 3 =8+2+2=8 + 5 =2 + 8 =6 + 6 =6 + 6 =7+3+1=精选20以内加减法练习题（四）姓名： 时间：_ 做对了 _题（共80题）8+2+4=82+6=3+6+9=4+5+8=7+3+2=4+42=2+6+5=2+3+4=8+2+6=6+2+7=7+25=6 + 3 + 8 =7+3+4=6+3+7=92+7=3+3+2=9+1+8=5+4+7=

8、82+8=2+2+4=8+2+5=4+5+8=94+7=4+8+7=5 + 4+ 9 =1+0+7=82+7=10+2+7 =5+2+2=961=94+7=12+6-5 =3+6+4=5 + 4 + 6 =6+2+9=77+5=5+2+7=5+1+7=82+3=8+2+7=73+6=2+3+9=94+6=8 3 + 7 =72+7=7+2+6=4+3+5=5+2+3=4+23=9+1+5=6+23=6+2+2=6+3+4=7+3+2=3+9+6=3+3+1=4+2+5=10 + 8-4 =10-5 + 4 =2+3+5=7+2+7=72+9=3+4+6=3 0 + 7 =8+1+2=6+2+7

9、=9 6+ 4 =55+5=1+8+5=8+2+7=4+5+8=73+4=6+3+9=63+9=7+57=6+26=10-1+2 =5+1+7=10 4 0 =87+6=精选姓名：. 时间：_ 做对了9+2=3+8=11-5=12-4=6+5=13-5=4+7=9+9=18-9=17-7=5+7=7+7=11-3=15-7=12-6=6+8=14-8=9+6=11-4=5+8=2+9=15-8=6+10=15-3=9+8=3+9=15-6=8+7=16-7=5+6=20以内的加减法（五）题（共40题）16-8=3+9=15-4=11-2=4+8=12+3=16-8=6+7=14-9=19-9=

10、精选姓名：, 时间：_ 做对了13-7=14-9=9+5=15-7=8+9=15-9=7+8=8+3=7+5=9+4=13-9=7+6=9+6=8+5=16-8=8+6=10+5=9+9=18-8=14-9=18-9=3+9=11-7=14-2=11-3=5+6=15-8=11-2=16-9=4+8=20以内的加减法（六）题（共40题）12-8=10+6=17-8=12-9=7+4=14-7=8+8=6+7=6+6=16-8=精选姓名：, 时间：_ 做对了15-7=13-7=12-8=16-7=15-8=13-9=8+5=10+3=9+3=7+8=13-8=9+5=9+4=5+8=17-8=8

11、+6=14-8=17-7=15-8=13-4=18-4=16-8=6+6=15-9=6+5=12-4=6+7=15-6=12-6=14-5=20以内的加减法（七）题（共40题）7+4=11-7=14-7=16-9=9+6=12-3=12+3=7+5=16-8=18-9=精选姓名：. 时间：_ 做对了9+3=12-5=4+9=3+8=17-7=12-10=10+6=16-7=9+6=8+7=4+13=11-1=11-2=12-7=17-9=5+6=9+8=15-9=6+8=13+6=8+4=8+8=7+9=10+2=6+5=4+7=13-8=14-6=3+9=12-8=20以内的加减法（八）题（

12、共40题）6+7=7+6=8+5=13-4=6+6=7+7=16-2=11-6=11-9=15-7=精选20以内加减法练习（九）姓名： 时间： 做对了 题（共50题）18- 5 =17-11 =13+ 6 =17- 5 =16-10 =7 +10 =4 - 0 = 10-10 =0 +16 =13+ 4 =3 +12 =2 +14 =14- 3 =12- 0 =3 + 5 =11+ 1 =5 - 4 =9 - 0 = 18-12 =9 - 0 =2 + 2 =6 5 =0 + 0 = 11-10 =11- 1 =11+ 0 =10+ 7 =17- 1 =9 4 = 18+ 1 =17-17 =

13、 15- 0 =13-12 = 15-13 =0 +17 = 11+ 4 =3 1 = 13-10 =0 + 1 =16- 1 =6 + 10 =10+ 2 =4 + 1 =4 + 12 =14+ 1 =7 - 2 =10+ 4 =13- 2 =15+ 4 =19-14 =精选20以内加减法练习（十）姓名：时间：_ 做对了 _题（共50题）3 +4=1 + 14=14 +2=4+1212 +5=14+ 1=10 +8=17-1515-3=9 8=11 +5=16+ 112 +3=17-12=1 +17=11+ 5=2 +6=19- 5=7 一3=12+ 410 +7=1 + 12=11 +1=

14、17-109 一9=4+12=11 +2=13+ 216-1=19-13=4 一3=1 4 14=15-3=6-5=13 +1=11+ 1=19-1=2 + 6=19-18=2 +11=2 +6=18-13=12 +7=3 + 1=3 +4=16-14=18-2=5 + 4=16 +216- 4精选20以内加减法练习（十一）姓名： 时间：_ 做又t 了_题（共50题）2 2 =7 3 =6 0 =7 +11 =13- 3 =8 6 =0 +18 =10+ 3 =18-11 =17+ 0 =2 2 =1 + 7 =6 3 =13+ 1 =5 +14 =11+ 0 =7 - 1 =0 +10 =6

15、 - 1 =2 + 6 =11-10 =11+ 3 =5 +10 =12-10 =0 +11 =5 +10 =5 5 二19-11 =精选17-13二2 + 2 =3 +11 =17- 3二1 0 =9 - 5 =8 + 0二17- 1 =13-10 =5 3二9 8 =7 3 =14- 2二5 3 二0 + 4 =17 14二16-14 =20以内加减法练习（十二）姓名： 时间：_ 做又t 了 _1 + 3二5 +11 =10+ 5 =10+ 3 =19- 8 =17+ 0 =2 2 =9 8 =题（共50题）11 - 1 =精选5 2二7 一6二12+ 6二10 +9二14 +5二1 +3

16、二2 +10二8 +10二10 +8二2 1二9 1二9 一5二1 +8二12 +6二9-3二8 一2二17-11二11-10二7-6二19-3二15-11=7 一4=16-14=5 2=8 一6二15-2二16-13二3 +11二8 一7二2 +17二5 +14二14 +4二精选11+ 3二5 +12二16-12 =17- 4二7 +11二18- 7 =19-15二18- 2二11 + 2 =3 +12二3-0二姓名：20以内加减法练习（十三） 时间： 做又t 了 _19- 5二10+ 1二2 +15 =12-11二3 3二18- 4 =16 16二1 + 8二1 +13 =18 -11二1

17、8- 7二0 +19 =题（共50题）19- 5 =19-10 =14- 4 =12+ 1 =精选7 + 2 =4 + 5 =14-12 =15-11二12+ 3二18-13二6 一0二1十7二18- 16二18-6二9 1二6一3二13- 1二19-15二8 0二6一6二0+ 19二9 2二3 3二12 +3二2+ 11二7 3二13-2二8一0二1+ 5二15 +3二18-15二2十4二19- 17二3 +6二2 1二17-10二1+ 15二7 一6二3 +6二精选2 +14 =5 + 13 =20以内加减法练习（十四）姓名：. 时间：_ 做又t 了_题（共50题）17- 2 =2 + 3

18、 =14+ 0 =13+ 0 =0 + 1 =1812 =18- 8 =0 + 1 =12-11 =4 +11 =12+ 7 =3 +13 =14+ 5 =19- 1 =14+ 1 =3 +12 =12+ 4 =17-11 =5 + 3 =17-11 =精选6 +10二17- 16二18-1二2十3二6 +12二12- 10二5 +10二3十6二17-14二11+ 1二19-17二4+5二5-3二19- 19二4 +3二7+1二4-3二3 + 1二4 一2二1+7二13 - 1二15- 3二7 1二12 +2二1 +10二7 + 10二15-10二18-6二15+ 1二19- 7二精选20以内

19、加减法练习（十五）姓名：.时间：_做对了_题（共50题）1 +7=3 -2=18- 3=16-14=1 +18=13-015- 019-19=17 +0=16-42-2=12-12=19-4=11 +2=3+ 153-0=0 +9=4+100+ 11=4 一 0=4 一3=0 +59一 0=19-18=17 +2=16 +1=12-10=9 - 1=1 +7=10 +85+ 217- 6=18-8=3 -0=0一 0=19- 1=11-10=12-10=7-312-11=15-12=15-116+ 10=1 + 13=4 +33+142+ 13=18- 2=8 4=6 2 =精选20以内加减法

20、练习（十六）姓名：， 时间：_ 做对了 一题（共50题）10 +27 一415-118 + 1013-31 + 124 +15=2 + 4=15-116-210 +3=1 + 14=16 +210 +72 +5=2 + 6=1 +214 +311 +8=1 + 1=17-161 +2=5 +14=12+ 4=18-1712 +317-15=6 - 1=6 一56 +2=16 +3=1 + 14=16 +14 + 152 +3=18-13=7 一115-117-6=3 + 15=1 +212 +316-1=5 + 12=15-1119-1811 +611+ 2精选9 - 1 =2 + 14 =2

21、0以内加减法练习（十七）姓名：_ 时间：_ 做对了题（共50题）19+ 0 =1 +18 =7 1 =1 + 16 =4 + 2 =16-15 =1 1 =17-16 =7 + 1 =5 2 =2 + 4 =19-17 =10 + 10 =6 1 =1 + 0 =1 +11 =2 +10 =0 + 4 =18-15 =12- 1 =15-13 =5 + 14 =3 + 0 =1 +15 =6 0 =8 0 =12+ 7 =15-11 =13+ 4 =0 + 0 =19- 8 =13+ 5 =18- 6 =18- 4 =1 +16 =1 + 13 =9 0 =8 0 =9 2 =2 + 10 =

22、14- 2 =18- 6 =19-14 =12- 2 =0 +17 =10+ 6 =5 + 4 =18- 6 =精选19-19 =1 + 14 =20以内加减法练习（十八）姓名：, 时间：一 做又t 了_题（共50题）16- 3二18- 4 =7 +11 =16-13 =12+ 5二10+ 3 =5 - 1 =5 + 1 =6 1二9 - 5 =4 + 1 =9 9 =14-10二16- 6 =13-10 =3 +14 =6 1二15- 5 =5 + 3 =15+ 4 =18- 2=19-13 =11+ 5 =5 + 3 =19- 1二16-14 =15- 4 =19- 8 =16 -14二2

23、 +12 =11+ 3 =19- 5 =17 -14二17+ 2 =4 +14 =13- 3 =1 +14二16-11 =12-10 =19- 8 =2 + 6二7 + 2 =14-10 =9 - 6 二19 - 5二6 5 二15- 5 =4 + 12 =精选3 +1317+ 3姓名：.20以内加减法练习（十九）时间： 做对了 _题（共50题）10+ 6=0+16=16-2=19- 1=2 +15=2+12=16-2=18-16=2 +17=10-10=19-7=14-13=15-15=12 - 1=0+ 11=7 +11=14-12=15- 2=11 +0=1 + 2=1 +15=0 +1

24、1=0+9=17-10=1 + 8=15+ 0=5+0=14+ 0=3 + 2=6 - 1=5+0=16- 1=13-12=1 + 3=9+0=8-7=18- 4=13-11=97=18- 4=2 + 5=10+ 5=3+ 11=15-14=17-1212-126+ 1017-17精选4 1 =5 2 =20以内加减法练习（二十）姓名：. 时间：一 做又t 了_题（共50题）15- 3 =1 +14 =6 +12 =2 1 =18- 6 =1 + 10 =15- 5 =9 2 =6 +13 =1 +14 =8 + 1 =14+ 5 =18- 1 =3 + 10 =14+ 4 =8 7 =12-

25、11 =17-16 =10+ 9 =3 + 4 =1 +13 =12+ 2 =10+ 3 =12+ 4 =3 +12 =16+ 2 =7 4 =19-10 =14-10 =11+ 6 =19-16 =2 + 12 =7 +11 =10+ 6 =2 + 4 =16+ 3 =3 +12 =17- 5 =19- 3 =11+ 8 =1 + 4 =18- 3 =1 + 7 =19- 4 =14+ 3 =3 +16 =15-12 =4 - 3 =精选11+ 820以内加减法练习（七）姓名：_时间：成绩:.4 + 4 =18- 1 =8 8 二15+ 2 =14 + 3 =5 + 3 =10+ 7 =17

26、- 3 =12+ 7 =10+ 3 =16 0 =3 +16 =15-14 =14- 2 =9 +10 =15-12 =5 3 二2 + 13 =18+ 0 =18- 3 =8 + 0 =1 0 =19-19 =6 1 =6 3 =11- 1 =13-11 =1 + 4 =16 2 =14 10 =14 13 =11+ 2 =11 0 =13-10 =14- 2 =16+ 2 =10 + 6 =14 3 =4+3 =18-17 =15-12 =19-18 =19-18 =6 + 12 =10+ 2 =17- 3 =7 3 =2 +11 =11+ 1 =13-10 =2 +10 =0 + 5 =

27、6 + 2 =12- 2 =17 6 =1 + 2 =2 +13 =13+ 4 =5 + 2 =19 5 =1 +12 =9 - 1 =2 + 1 =11+ 4 =18+ 1 =12-12 =15- 2 =7 + 12 =1 +14 =19-10 =19-12 =4 一1=17-15 =2 + 3 =16-16 =1 0 =7 - 1 19- 1 =1 + 4 =2 + 2 =1 +15 =19-18 =19-18 =17- 1 =3 - 0 =7 0 =7 - 1 -精选12-11 =3 +13 =0 +10 =11+ 0 =8 一 6 二5 +12 =19-18 =15-10 =17- 1

28、 =1 +13 =11 + 8 =12+ 3 =16 1 =20以内加减法练习（八）姓名：_时间：成绩：17- 5 =0 + 18 =18-14 =17- 6 =8 7 =13+ 0 =2 + 2 =5 + 2 =8 + 0 =3 + 6 =4 +12 =9 5 =6 1 =2 + 3 =17+ 2 =3 + 13 =5 0 =3 - 0 =11+ 5 =0 + 4 =9 +10 =14-11 =8 + 0 =3 + 10 =11+ 7 =16 0 =5 + 3 =0 +11 =1 + 8 =12- 2 =15 1 =6 5 =19 - 4 =19-15 =9 一 8 =3 + 6 =18 5

29、 =8 +11 =5 + 3 =17+ 1 =14+ 2 =3 + 4 =14-12 =18 7 =4 +13 =2 + 7 =15- 1 =18-18 =3 +16 =11 10 =2 - 2 =4 + 3 =16 - 6 =6 +10 =17+ 2 =8 + 1 =8 一 6 =4 + 2 =9 - 4 =10+ 3 =1 +15 =6 5 =1 +12 =13-11 =17-15 =14+ 1 =17-16 =16- 5 =18-10 =15-10 =1 +18 =2 1 =10+ 5 =8 一 8 =5 + 3 =1 +17 =16-15 =16+ 2 =2 - 1 =10+ 3 =3

30、 +11 =11 10 =1 + 7 =6 + 3 =2 +12 =11 10 =1 +12 =7 +10 =精选12+ 2 =16-11 =7 7 =5 +12 =2 +16 =7 - 3 -14- 1 =11 + 2 =5 3 =16 3 =12+ 1 =9 - 5 二20以内加减法练习（九）姓名：一时间：成绩：18-11 =10 + 7 =15-12 =1 +16 =1 +16 =5 5 二3 + 3 =10+ 6 =18-12 =7 7 =4 1 12- 1 =0 + 1 =7 0 =1 +10 =15 5 =2 + 3 =19 9 =17- 4 =11+ 2 =4 4 =16+ 1

31、=6 2 =16- 1 =16+ 3 =5 5 =18+ 0 =7 +11 =5 +12 =13- 2 =2 + 6 =8 4 =16+ 3 =1 +13 =4 - 0 =7 2 =18-10 =17 5 =8 3 二0 +11 =9 + 0 =16 6 16 0 2 + 4 =13+ 3 =4 0 =3 + 2 =16-12 =17 4 =0 + 16 =0 + 6 =19+ 0 =10+ 4 =8 2 =3 +11 =2 + 6 =11+ 3 =19 5 =2 +11 =11+ 3 =10 + 10 =16-14 =9 4 =4 + 3 =5 4 =7 - 5 =5 + 4 =5 3 =1

32、7- 3 =17 - 4 =14- 2 =2 + 1 =15+ 3 =1 + 4 =19-17 =7 + 2 =17-16 =15 - 4 =15-12 =14-12 =3 + 3 =5+1 =19- 5 =18-16 =2 + 6 =18 - 8 =2 +16 =8 - 5 二15+ 1 =7 3 =5 2 =16-13 =精选14+ 3 =14+ 1 :=13- 2 =3+1412+ 3 =10+ 6=3 +15 =13- 220以内加减法练习（十）姓名：_时间：成绩：1 +16 =14+ 2=1 +14 =3+147 - 5 =7 - 1=10 0 =15+ 15 +10 =2+5=11

33、+ 6 =8 811+ 7 =9 一 6=10+ 6 =1 + 07 - 1 =17+ 0=19- 2 =15-108 - 2 =11+ 0=5 + 2 =4+102 + 4 =2+3=12+ 3 =15-141 +16 =16- 3=18-10 =17- 415- 4 =15+ 2=16-14 =8 + 1015-10 =15- 2=3 - 3 =0 + 1915- 2 =2 + 10=5 +14 =8 415- 4 =7-3=2 +10 =7 +1111-10 =14+ 2=12+ 0 =4+319-19 =4+15=13- 0 =12-125 +10 =1 + 1=19 3 =15- 2

34、9 - 2 =17- 3=8 6 =10+ 118- 5 =1 + 10=19-18 =8-22 + 2 =8-7=11+ 1 =16+ 34 +10 =19- 9=3 + 0 =19- 512- 1 =17- 3=3 + 1 =17-1217-16 =12-11=3 +10 =5 - 19 - 3 =10+ 9=19- 6 =2 + 1017- 2 =4+15=3 + 2 =1 + 1精选13+ 6=1 + 2=6-2=18- 1=20以内加减法练习（十一）姓名：时间：成绩：0 +11=5+14=0+7=0+6=19-16=0+0=18-13=18- 1=0 +11=1 + 17=0+2=1

35、3-10=0 + 3=1 + 15=9-9=10-10=3 +12=16- 0=0+0=17- 3=19- 6=2 + 13=1 +10=2 + 13=5 +12=12+ 7=8-7=7-4=9 + 0=3+12=0 +11=5 + 1=12+ 0=18-11=1 + 4=19- 5=1 +15=2 + 4=16+ 1=6 +11=18- 7=19-11=10+ 9=6-5=16- 5=1 + 7=12-10=7+2=5 - 1=10+ 4=11+ 3=17-15=15- 3=15- 4=17- 1=3+5=18- 8=6-4=14-10=3 + 1=9 - 1=19-10=2 + 2=7 +

36、 1=19- 68 一 4=2 +11=17- 2=12+ 1=17-14=18- 6=4+3=3 +10=14-12=12- 1=2 + 16=14+ 1=16-11=13-11=2+14=5 +10=15+ 2=1 +18=17-10=12+ 119- 2=7 6=1 + 7=6 - 117+ 2=7 - 17 + 117-14 =7 6 =16- 5 =3 + 10 =精选19-14二9-2二19-18二7-6二1 +11二2 + 10二18- 3二10+ 9二20以内加减法练习（十二）姓名：时间：成绩：14+ 4二0+3二17-11二18-12二18- 5二14+ 4二0 +12二3

37、+11二7 +10二7+0二2 + 6二5 + 12二5 +12二18- 3二19- 3二7-4二2 + 4二7 1二18-12二2 + 17二9- 8=10+ 1二7-5二7 +11二12+ 3二1 + 14二17-14二1 + 15二1 + 1二9-5二6 + 1二0 + 17二6 +11二0 + 17二6 1二16- 5二13- 2二6+12二15-14二7+0二12+ 7=2 + 10=5 +11=6+0=13-10二16-13二5+2二16-14二5 +13二2 + 10二12+ 3二3 + 1二19- 1=4 一 4=0 +18=12+ 5=2 +13二2 + 15二19-13二18+ 0二4 +13二9-0二6-5二15- 4二10 + 2二6 + 13二3+6二12+ 1二1 +18二18-11二1 + 8二4 + 4二12+ 4二0+16二8-2二3 + 10二2 + 1二6-6二3 +13二6-3二4 +13二5 + 1二7-5二19-19二13 + 2二16-14二16+ 3二13-13二6-2二4+12二10+ 0二6-