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第 28 页 共 28 页
(1)x﹣=,
(2) x=,
(3) ﹣4x=,
(4) 82.5﹣2x=13.6
(5) 0.78:x=3:5,
(6)1﹣20%x=0.4,
(8) 1(x﹣)=6,
(9)2x﹣x=1.2,
(10)93﹣1.7x=13.4,
(11)x﹣25%x=24,
(12)x﹣+0.2=,
(13)0.6x+90%x=78,
(14)20%x﹣2.43=0.8,
(15)x﹣x=42,
(16)0.6x+32.5=67.5,
(17)1(x﹣0.45)=5,
(18)x﹣2.25=8.25,
(19):x=3:12,
(20)x+0.8=5.6,
(21) 1.4:x=1:0.75,
(22) x(2﹣)=24,
(23) 4x﹣=3,
(24)12x+70.3=20.1,
(25)x+x=,
(26)x:42=,
(27)0.5+x=,
(28)0.8:=0.48:x,
(29)χ﹣χ=,
(30)42:=χ:
(31)5x﹣0.4=75%,
( 32) 6x﹣0.9=4.5,
(33)2(x﹣3)=5.8,
(34) 1.6x=6.4,
(35) 4x﹣39=29,
(36)16+8x=40,
(37) x1.1=3,
(38)+2x=,
(39)3﹣7x=1.04,
(40)x﹣1﹣x=2,
(41)x﹣x=14,
(42)3x﹣x=,
(43)=,
(44)1.2:=,
(45)=:,
(46):=x:0.8,
(47)x=+1,
(48)1﹣25%X+25%x=+25%x,
(49)=,
(50)X=,
(51) 5:8=x:32,
(52)2x+30.9=24.9,
(53)5.3x﹣2.9x=,
(54)(7﹣2.8x)=1.5,
(55)x:0.3=:,
(56)150%x+66=99
(57)x+6﹣0.8x=16
(58)
(59)
(60)3(X﹣)=1.3
(61)(X+0.5):2=(X﹣4):,
(62) X0.05=3.528,
(63)2X﹣46=80,
(64)44.5﹣3X=6.38,
(65)4X﹣7.2=10,
(66)11.5X+X=20,
(67)3.812+15X=87.6,
(68)6X+5=17,
(69)0.6(2.5+X)=4.2,
(70):=X:,
(71),
(72)
(73),
(74)4(+x)=,
(75)0.25+x=,
(76)x﹣,
(77)200:6=x:,
(78)4X=,
(79)8(x﹣2)=2(x+7),
(80):18%=,
(81)﹣2x=,
(82)x+x=46,
(83):x=:,
(84)=,
(85)5(3x﹣4)﹣2(x﹣1)=5(2x﹣1)
(86)=,
(87)8(2X﹣7)=5(X+13),
(88)3(x+4.5)=60,
(89)1.6x+2.4=7.52,
(90)3(x﹣0.8)=6.3,
(91)28.4﹣5x=5.8,
(92)x:=
(93)+2x=,
(94)x=15%,
(95)x﹣x=,
(96)x+50%x=6,
(97):x=0.3:12,
(98)4x+2(8﹣x)=26,
(99)x﹣=0,
(100)+x=1,
(101)x(+)=,
(102),
(103),
(104)x﹣,
(105)x,
(106)5x+35=650,
(107)7203x=80,
(108)3.6x﹣0.9x=8.1,
(109)44.5﹣3x=6,
(110)=,
(111)63﹣1.8X=7.2,
(112)x=,
(113)x=42,
(114)x+=,
(115)7x3=8.19,
(116)12:0.6=x:,
(117)3(x+2)=4(x+1),
(118)3x﹣70%x=9.2,
(119) 6+x=240,
(120)22.5﹣0.4x=12.5,
(121)x:3.5=4:2,
(122)x﹣0.8x﹣6=16,
(123):=x:8,
(124),
(125)x:15=:,
(126)x+x=,
(127)x50%﹣x=5,
(128)1﹣x=,
(129)2.5+1x=3,
(130)3x﹣2=4,
(131)8.5﹣3x=2,
(132)3x=4,
(133)x﹣5%=17.54,
(134):=:(4﹣x),
(135) 6x+31=49,
(136) 7x3=8.19,
(137) 32.8﹣9x=17.5,
(138) x﹣0.36x=16,
(139) 67+3x=69,
(140) 6x+2x﹣56=0,
(141) 3x﹣0.454=2.7,
(142) 5.8x﹣4.6x=0.96,
(143) 8.4(9﹣x)=3,
(144) 3x1.2=8,
(145)5x+28=71,
(146)8.7﹣1.2x=3.9,
(147)8x﹣2.6x=37.8,
(148)0.75x﹣0.954=8.5,
(149)542+3x=72,
(150)8x﹣2.6=37.8,
(151)x=,
(152)x+30%x=26,
(153) 7.8﹣3x=3.6,
(154) 63﹣1.8x=7.2,
(155)10:x=4.5:0.8,
(156):=x:,
(157)X﹣7.65=4.64,
(158)28.25﹣X=8.25,
(159)X﹣(3.6+2.97)=12.42,
(160)x=,
(161)14.5=5.5,
(162)x﹣80%x=48,
(163)75%x﹣5=6,
(164)x﹣6.8=15.4,
(165)1.9x=5.7,
(166)4.3y﹣y=4.6,
(167)5x+2.6=7.6,
(168) x﹣1.5=12.9,
(169) 9x+5x=8.4,
(170) 6.8+3.2x=14.8,
(171)5x=,
(172)﹣x=,
(173)4.5﹣3x=1.5,
(174)(1+25%)x=0.5,
(175)x﹣40%x=9,
(176)x20%=15.2,
(178)x﹣x=,
(179)x75%=3,
(180)4x﹣,
(181):x=:4.5,
(182)(x﹣4.5)6=12.5,
(183)27﹣17x=13.4,
(184)9.6+3x=3.245,
(185)2x+5=5x﹣7,
(186) 3(x﹣2)=2﹣5(x﹣2),
(187)4x﹣3(20﹣x)+4=0,
(188)﹣=1,
(189)4x﹣56=12,
(190)8x﹣3x=15.6,
(191)30(x4)=60,
(192)7.20.5﹣3x=1.2,
(193)5x﹣2.45=8,
(194)+x=2,
(195)5x+2.415=66,
(196)3.2x+2.8x-x=1,
(197)2.516-8x=12,
(198)9.6-3x=6.3,
(199)5(x+6)=75,
(200)x0.7+0.93=4,
解方程专项练习200题答案:
(1)x﹣=,
=,
,
x=;
(2) x=,
x=,
x21=21,
x=12;
(3) ﹣4x=,
﹣4x+4x=+4x,
=+4x,
4=4x4,
x=.
(4) 82.5﹣2x=13.6
20﹣2x=13.6,
13.6+2X=20,
2X=6.4,
x=3.2;
(5) 0.78:x=3:5,
3x=0.785,
3x=3.9,
x=1.3
(6)1﹣20%x=0.4,
1﹣20%x+20%x=0.4+20%x,
0.4+20%x=1,
0.4+20%x﹣0.4=1﹣0.4,
20%x=0.6,
20%x=0.6,
x=3;
(8) 1(x﹣)=6,
1(x﹣)(x﹣)=6(x﹣),
1=6(x﹣),
6x﹣6=1,
6x﹣3=1,
6x=4,
6x6=46,
x=
(9)2x﹣x=1.2,
x(2﹣)=1.2,
x=1.2,
x=1.2,
x=1;
(10)93﹣1.7x=13.4,
27﹣1.7x=13.4,
27﹣1.7x+1.7x=13.4+1.7x,
13.4+1.7x=27,
13.4+1.7x﹣13.4=27﹣13.4,
1.7x=13.6,
1.7x1.7=13.61.7,
x=8
(11)x﹣25%x=24,
75%x=24,
75%x75%=2475%,
x=32;
(12)x﹣+0.2=,
x﹣0.6=,
x﹣0.6+0.6=+0.6,
x=,
x=,
x=1
(13)0.6x+90%x=78,
1.5x=78,
1.5x1.5=781.5,
x=52;
(14)20%x﹣2.43=0.8,
20%x﹣7.2=0.8,
20%x﹣7.2+7.2=0.8+7.2,
20%x20%=820%,
x=40;
(15)x﹣x=42,
x=42,
x=42,
x=252
(16)0.6x+32.5=67.5,
0.6x+7.5=67.5,
0.6x+7.5﹣7.5=67.5﹣7.5,
0.6x=60,
0.6x0.6=600.6,
x=100;
(17)1(x﹣0.45)=5,
(x﹣0.45)(x﹣0.45)=(x﹣0.45),
x﹣2.4=1.6,
x﹣2.4+2.4=1.6+2.4,
x=4,
x=4,
x=
(18)x﹣2.25=8.25,
x﹣2.25+2.25=8.25+2.25,
x=10.5;
(19):x=3:12,
3x=12,
3x3=93,
x=3
(20)x+0.8=5.6,
x+0.8﹣0.8=5.6﹣0.8,
x=4.8,
x=4.8,
x=8.
(21) 1.4:x=1:0.75,
x=1.40.75,
x=1.05
(22) x(2﹣)=24,
x=24,
x=24,
x=20;
(23) 4x﹣=3,
4x﹣+=3+,
4x=4,
4x4=44,
x=1
(24)12x+70.3=20.1,
12x+2.1=20.1,
12x+2.1﹣2.1=20.1﹣2.1,
12x12=1812,
x=1.5;
(25)x+x=,
x=,
x,
x=;
(26)x:42=,
10x=42,
10x10=3010,
x=3
(27)0.5+x=,
0.75+x=3.75,
0.75+x﹣0.75=3.75﹣0.75,
x=3,
x=3,
x=6;
(28)0.8:=0.48:x,
0.8x=0.48,
0.8x=0.2,
0.8x0.8=0.20.8,
x=
(29)χ﹣χ=,
x=,
x=,
x=3;
(30)42:=χ:
x=42,
x=30,
x=50;
(31)5x﹣0.4=75%,
5x﹣0.4+0.4=75%+0.4,
5x5=1.155,
x=0.23
( 32) 6x﹣0.9=4.5,
6x﹣0.9+0.9=4.5+0.9,
6x=5.4,
6x6=5.46,
x=0.9;
(33)2(x﹣3)=5.8,
2(x﹣3)2=5.82
x﹣3=2.9,
x﹣3+3=2.9+3,
x=5.9;
(34) 1.6x=6.4,
1.6x1.6=6.41.6,
x=4;
(35) 4x﹣39=29,
4x﹣27=29,
4x﹣27+27=29+27,
4x=56,
4x4=564,
x=14;
(36)16+8x=40,
16+8x﹣16=40﹣16,
8x=24,
8x8=248,
x=3;
(37) x1.1=3,
x1.11.1=31.1,
x=3.3
(38)+2x=,
+2x=,
2x=,
2x2=2,
x=;
(39)3﹣7x=1.04,
2.16﹣7x=1.04,
2.16﹣7x﹣1.04=1.04﹣1.04,
1.12﹣7x=0,
7x7=1.127,
x=0.16;
(40)x﹣1﹣x=2,
x﹣1=2,
x﹣1+1=2+1,
x=3,
x=3,
x=18;
(41)x﹣x=14,
x=14,
x=14,
x=18;
(42)3x﹣x=,
x=,
x=,
x=;
(43)=,
2.4x=720.26,
2.4x=18.72,
2.4x2.4=18.722.4,
x=7.8;
(44)1.2:=,
x=1.25,
x=6,
x=6,
x=9;
(45)=:,
x=18,
x=,
x=,
x=12;
(46):=x:0.8,
x=0.8,
x=0.04,
x=0.2;
(47)x=+1,
x=,
x=1
(48)
1﹣25%X+25%x=+25%x,
0.25x+0.25﹣0.25=1﹣0.25,
0.25x=0.75,
x=3;
(49)=,
0.25x=1.251.6,
0.25x0.25=1.251.60.25,
x=8;
(50)X=,
X=,
x=;
(51) 5:8=x:32,
8x=532,
8x8=5328,
x=20
(52)2x+30.9=24.9,
2x+2.7=24.9,
2x+2.7﹣2.7=24.9﹣2.7,
2x2=22.22,
x=11.1;
(53)5.3x﹣2.9x=,
2.4x=,
2.4x2.4=2.4,
x=;
(54)(7﹣2.8x)=1.5,
(7﹣2.8x)=1.5,
7﹣2.8x=2.1,
7﹣2.8x+2.8x=2.1+2.8x,
7﹣2.1=2.1+2.8x﹣2.1,
4.92.8=2.8x2.8,
x=1.75;
(55)x:0.3=:,
x=0.3,
x=,
x=
(56)
150%x+66=99
1.5x+66=99
1.5x=33
x=22
(57)x+6﹣0.8x=16
0.2x+6=16
0.2x=10
x=50
(58)
x=14.4
(59)
0.55x=5.5
x=10
(60)3(X﹣)=1.3
3(X﹣)(x﹣)=1.3(x﹣),
3=1.3x﹣0.78,
3+0.78=1.3x﹣0.78+0.78,
4.68=1.3x,
4.681.3=1.3x1.3,
x=3.6;
(61)(X+0.5):2=(X﹣4):,
(x﹣4)=(x+0.5),
x﹣4=x+0.5,
x﹣10﹣x=x+x,
2.25x﹣10+10=0.125+10,
2.25x2.25=10.1252.25,
x=4.5
(62) X0.05=3.528,
X0.050.05=3.5280.05,
X=0.1764;
(63)2X﹣46=80,
2X﹣24=80,
2X﹣24+24=80+24,
2X=104,
2X2=1042,
X=52;
(64)44.5﹣3X=6.38,
18﹣3X=6.38,
18﹣3X+3X=6.38+3X,
6.38+3X=18,
6.38+3X﹣6.38=18﹣6.38,
3X=11.62,
3X3=11.623,
X=;
(65)4X﹣7.2=10,
4X﹣7.2+7.2=10+7.2,
4X=17.2,
4X4=17.24,
X=4.3;
(66)11.5X+X=20,
12.5X=20,
12.5X12.5=2012.5,
X=1.6;
(67)3.812+15X=87.6,
45.6+15X=87.6,
45.6+15X﹣45.6=87.6﹣45.6,
15X=42,
15X15=4215,
X=2.8
(68)6X+5=17,
6x+5﹣5=17﹣5,
6x6=126,
x=2;
(69)0.6(2.5+X)=4.2,
0.6(2.5+X)0.6=4.20.6,
2.5+x=7,
2.5+x﹣2.5=7﹣2.5,
x=4.5;
(70):=X:,
x=,
x=,
x=0.6
(71),
,
,
;
(72)
,
,
,
,
;
(73),
,
,
(74)4(+x)=,
+4x=,
+4x﹣=﹣,
4x=4,
x=1;
(75)0.25+x=,
0.2+x=,
0.2+x﹣0.2=﹣0.2,
x=,
x=
(76)x﹣,
,
,
x=;
(77)200:6=x:,
6x=200,
6x6=4806,
x=80
(78)4X=,
4XX=X,
X=4,
X=4,
X=10;
(79)8(x﹣2)=2(x+7),
8X﹣16=2X+14,
6X﹣16=14,
6X=30,
X=5;
(80):18%=,
X=0.186.5,
X=1.17,
X=7.8
(81)﹣2x=,
﹣2x+2x=+2x,
+2x=,
+2x﹣=﹣,
2x=,
2x2=2,
x=;
(82)x+x=46,
x(+)=46,
x=46,
x=46,
x=40;
(83):x=:,
x=,
x=,
x=,
x=;
(84)=,
1.6x=6.42,
1.6x=12.8,
1.6x1.6=12.81.6,
x=8
(85)5(3x﹣4)﹣2(x﹣1)=5(2x﹣1)
15x﹣20﹣2x+2=10x﹣5,
13x﹣18=10x﹣5,
13x﹣18﹣10x=10x﹣5﹣10x,
3x﹣18=﹣5,
3x﹣18+18=﹣5+18,
3x=13,
3x3=133,
x=;
(86)=,
3(6x﹣1)=64,
18x﹣3=64,
18x﹣3+3=64+3,
18x=67,
18x18=6718,
x=
(87)8(2X﹣7)=5(X+13),
16x﹣56=5x+65,
16x﹣56﹣5x=5x+65﹣5x,
11x﹣56=65,
11x﹣56+56=65+56,
11x=121,
11x11=12111,
x=11,
(88)3(x+4.5)=60,
3(x+4.5)3=603,
x+4.5=20,
x+4.5﹣4.5=20﹣4.5,
x=15.5
(89)1.6x+2.4=7.52,
1.6x+2.4﹣2.4=7.52﹣2.4,
1.6x=5.12,
1.6x1.6=5.121.6,
x=3.2;
(90)3(x﹣0.8)=6.3,
3x﹣2.4=6.3,
3x﹣2.4+2.4=6.3+2.4,
3x=8.7,
3x3=8.73,
x=2.9;
(91)28.4﹣5x=5.8,
28.4﹣5x+5x=5.8+5x,
5.8+5x=28.4,
5.8+5x﹣5.8=28.4﹣5.8,
5x=22.6,
5x5=22.65,
x=4.52
(92)
x:=
25x=3,
25x=,
25x25=,
x=;
(93)+2x=,
+2x=,
2x=0,
x=0;
(94)x=15%,
xx=15%x,
0.15x=0.15,
0.15x0.15=0.150.15,
x=1;
(95)x﹣x=,
x=,
x=,
x=.
(96)x+50%x=6,
1.5x=6,
1.5x1.5=61.5,
x=4;
(97):x=0.3:12,
0.3x=,
0.3x0.3=90.3,
x=30;
(98)4x+2(8﹣x)=26,
4x+16﹣2x=26,
2x+16=26,
2x+16﹣16=26﹣16,
2x2=102,
x=5
(99)x﹣=0,
x﹣+=0+,
x=,
x3=3,
x=;
(100)+x=1,
+x﹣=1﹣,
x=,
x=,
x=1;
(101)x(+)=,
x=,
x=,
x=.
(102),
,
,
3x3=,
x=;
(103),
,
,
x=20;
(104)x﹣,
,
,
x=;
(105)x,
x,
x=
(106)5x+35=650,
5x+35﹣35=650﹣35,
5x=615,
5x5=6155,
x=123;
(107)7203x=80,
7203x3x=803x,
240x=720,
240x240=720240,
x=3;
(108)3.6x﹣0.9x=8.1,
(3.6﹣0.9)x=8.1,
2.7x=8.1,
2.7x2.7=8.12.7,
x=3;
(109)44.5﹣3x=6,
18﹣3x=6,
18﹣3x+3x=6+3x,
6+3x=18,
6+3x﹣6=18﹣6,
3x=12,
3x3=123,
x=4
(110)=,
2.5x=100.8,
2.5x2.5=82.5,
x=3.2;
(111)63﹣1.8X=7.2,
18﹣1.8X=7.2,
18﹣1.8X+1.8X=7.2+1.8X,
7.2+1.8X=18,
7.2+1.8X﹣7.2=18﹣7.2,
1.8X=10.8,
1.8X1.8=10.81.8,
X=6
(112)x=,
x=,
x=;
(113)x=42,
x=42,
x=9;
(114)x+=,
x+﹣=﹣,
x=,
x=,
x=
(115)7x3=8.19,
7x33=8.193,
7x=24.57,
7x7=24.577,
x=3.51;
(116)12:0.6=x:,
0.6x=12,
0.6x=6,
0.6x0.6=60.6,
x=10;
(117)3(x+2)=4(x+1),
3x+6=4x+4,
3x+6﹣3x=4x+4﹣3x,
x+4=6,
x+4﹣4=6﹣4,
x=2
(118)3x﹣70%x=9.2,
3x﹣0.7x=9.2,
2.3x=9.2,
2.3x2.3=9.22.3,
x=4;
(119) 6+x=240,
6+x﹣6=240﹣6,
x=234,
x=234,
x=390
(120)22.5﹣0.4x=12.5,
22.5﹣0.4x+0.4x=12.5+0.4x,
12.5+0.4x=22.5,
12.5+0.4x﹣12.5=22.5﹣12.5,
0.4x0.4=100.4,
x=25;
(121)x:3.5=4:2,
2x=3.54,
2x2=142,
x=6
(122)x﹣0.8x﹣6=16,
0.2x﹣6=16,
0.2x﹣6+6=16+6,
0.2x0.2=220.2,
x=110;
(123):=x:8,
x=8,
x=8,
x=4;
(124),
0.06x=20.015,
0.06x0.06=0.030.06,
x=0.5;
(125)x:15=:,
x=15,
x6=156,
x=40;
(126)x+x=,
x=,
x=,
x=;
(127)x50%﹣x=5,
x=5,
x6=56,
x=30;
(128)1﹣x=,
1﹣x+x=+x,
+x=1,
+x﹣=1﹣,
x=,
x=;
(129)2.5+1x=3,
2.5+1x﹣2.5=3﹣2.5,
x=,
x=,
x=
(130)3x﹣2=4,
3x﹣2+2=4+2,
3x=6,
3x3=63,
x=;
(131)8.5﹣3x=2,
8.5﹣3x+3x=2+3x,
3x+2=8.5,
3x+2﹣2=8.5﹣2,
3x=6,
3x3=63,
x=2;
(132)3x=4,
3xx=4x,
4x=3,
4x4=34,
x=
(133)x﹣5%=17.54,
解:x﹣5%+5%=17.54+5%,
x=17.59,
x=23;
(134):=:(4﹣x),
解:4x=,
2﹣x+x=x,
2﹣+x,
=x,
x=3
(135) 6x+31=49,
6x+31﹣31=49﹣31,
6x=18,
6x6=186,
x=3;
(136) 7x3=8.19,
7x33=8.193,
7x=24.57,
7x7=24.577,
x=3.51;
(137) 32.8﹣9x=17.5,
32.8﹣9x+9x=17.5+9x,
17.5+9x=32.8,
17.5+9x﹣17.5=32.8﹣17.5,
9x=15.3,
9x9=15.39,
x=1.7;
(138) x﹣0.36x=16,
(1﹣0.36)x=16,
0.64x=16,
0.64x0.64=160.64,
x=25;
(139) 67+3x=69,
42+3x=69,
42+3x﹣42=69﹣42,
3x=27,
3x3=273,
x=9;
(140) 6x+2x﹣56=0,
(6+2)x﹣56+56=0+56,
8x=56,
8x8=568,
x=7
(141) 3x﹣0.454=2.7,
3x﹣1.8=2.7,
3x﹣1.8+1.8=2.7+1.8,
3x=4.5,
3x3=4.53,
x=1.5;
(142) 5.8x﹣4.6x=0.96,
1.2x=0.96,
1.2x1.2=0.961.2,
x=0.8;
(143) 8.4(9﹣x)=3,
9﹣x=8.43,
9﹣x=2.8,
x=9﹣2.8,
x=6.2;
(144) 3x1.2=8,
3x1.21.2=81.2,
3x=9.6,
3x3=9.63,
x=3.2
(145)5x+28=71,
5x+28﹣28=71﹣28,
5x=43,
5x5=435,
x=8.6;
(146)8.7﹣1.2x=3.9,
8.7﹣1.2x+1.2x﹣3.9=3.9+1.2x﹣3.9,
4.8=1.2x,
1.2x=4.8,
1.2x1.2=4.81.2,
x=4;
(147)8x﹣2.6x=37.8,
5.4x=37.8,
5.4x5.4=37.85.4,
x=7;
(148)0.75x﹣0.954=8.5,
0.75x﹣3.8=8.5,
0.75x﹣3.8+3.8=8.5+3.8,
0.75x=12.3,
0.75x0.75=12.30.75,
x=16.4,;
(149)542+3x=72,
27+3x=72,
27+3x﹣27=72﹣27,
3x=45,
3x3=453,
x=15;
(150)8x﹣2.6=37.8,
8x﹣2.6+2.6=37.8+2.6,
8x=40.4,
8x8=40.48,
x=5.05
(151)x=,
x=,
x=,
x4=4,
x=;
(152)x+30%x=26,
(1+30%)x=26,
1.3x=26,
1.3x1.3=261.3,
x=20;
(153) 7.8﹣3x=3.6,
7.8﹣3x+3x=3.6+3x,
3.6+3x=7.8,
3.6+3x﹣3.6=7.8﹣3.6,
3x=4.2,
3x3=4.23,
x=1.4
(154) 63﹣1.8x=7.2,
18﹣1.8x=7.2,
18﹣1.8x+1.8x=7.2+1.8x,
18=7.2+1.8x,
18﹣7.2=7.2+1.8x﹣7.2,
10.8=1.8x,
10.81.8=1.8x1.8,
x=6;
(155)10:x=4.5:0.8,
4.5x=100.8,
4.5x=8,
4.5x4.5=84.5,
x=;
(156):=x:,
x=,
x=,
x=,
x=
(157)X﹣7.65=4.64,
X﹣7.65+8.67=4.64+7.65,
X=12.29;
(158)28.25﹣X=8.25,
28.25﹣X+X=8.25+X,
X+8.25=28.25,
X+8.25﹣8.25=28.25﹣8.25,
X=20;
(159)X﹣(3.6+2.97)=12.42,
X﹣6.57=12.42,
X﹣6.57+6.57=12.42+6.57,
X=18.99
(160)x=,
xx=x,
x=,
x=,
x=,
x=;
(161)14.5=5.5,
14.5+14.5=5.5+14.5,
=20,
8=208,
x=160
(162)x﹣80%x=48,
(1﹣0.8)x=48,
0.2x=48,
0.2x0.2=4
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