复杂方程计算专项练习91题有答案doc.docx
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复杂方程计算专项练习91题有答案doc.docx
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复杂方程计算专项练习91题有答案doc
小学复杂方程专项练习91题(有答案)
(1)2x+5=5x-7,
(6)X+(3X-16)皂=]0(X+l),
4
(8)6(3x-2)-4(4x-3)=1-8x,
(4)5-r(X+I6.81)二i,
5
(9)4(x-2)+20x-4=5(1-2x),
(10)1.6-r(x-0.45)=5,
(5)O.2x+E=8-i§x,
5%
(16)2(x+2)-3=3x-5,
(11)35(x・2)-15(5x・6)=(22x・63)-21(3x-4),
(14)Ex・2直=0.25■二x,
71128
(15)5X+7.25=12」・2.5X,
4
(21)8(x-2)=2x+7,
(26)(X+12)x&2・X,
5
(27)2X(X-0.55)理,
77
(29)呈2=2.5,
3x+5
(25)
x+(3x-16)v25%=10(x+2),
(30)60。
(x+10)=5
(31)%(28-2x)=6(x-5)
8
(32)
64。
(2x・5)=32
(38)-(x+2)=x+l
4
(34)
1X(x-45%)=2.8,
5
(39)76(x・2)=52x・32
(35)
5(X+4)=26.6-X,
(40)8lx-342=76(x-2)
(36)
100x0.5+(x-100)x0.4=0.48x
(41)3(2-x)+5(4x-3)=4(x+1)
(42)
15-(5.5-x)=2x
(47)30%x+85=70%x+25,
(43)
16+x=12+2x+x
(48)8.5xl.2-5.3x=8.5-4x
(44)
2(x-4)=3(x-12)
(49)5x-2(3-2x)=16x-23
(45)
().4+(4-x)=1+4
(50)(x-5)x5-9=(x-12)xl2
(46)
8(x-2)=2(x+7),
(51)(10-x)v2=5x-7
(52)2.7x-l.8=1.2x+2.7,
(57)
X_x-16
3.51.5
(53)8-5(6x+0.7)=10x+0.5,
(58)X+(3X-16)小25%=10(X+l)
(59)75。
(x+10)=2,
(54)8.5x・3.9x=55.2(x-18),
(55)122-x-19=(x-19)x5,
(60)5x・3x(28-x)=12+2x,
(56)3.5x+2=4x-1,
(61)6(x+l)=0.5(lOx+16),
(62)
5(x+2)=4(x+9),
(67)4x-2(5.5-x)=3.5x-8,
(63)
127$(2x+3)=15,
(68)2.8x=19.32・6.4x,
(64)
3(x+2)=4(x+1),
(69)5(y-4)-7(7-y)・9=12・3(9・y),
(65)
8(x-1.5)=x+0.6,
(70)35(x・2)・15(5x-6)=22x-63-21(3x・4),
(66)
7(x+6)-3x=4(2x+5),
(71)2.6x=51.6-3.4x,
(72)3(4x-2)-2(3x+3)=9-8x,
(77)(0.6x+420)4-(x+20)=3,
(73)
20+4x=6x・24,
(78)35(2-x)+15(6-5x)=22x+7+21(4・3x)
(74)
5(x-1)=x+l,
(79)5(3x-4)-2(x-1)=5(2x-1)
(75)
3(3x-2)=10-0.5(x・3.5),
(80)&=4.9+』x,
35
(76)
0.4(x-0.2)+l.5=0.7x-0.38,
(81)3x+5x』=2x+巨旦
443
(82)X+3.2=(18-x):
5,
(87)(9+21)x=66x-?
60-40-440,
(83)4(4x・6)=5(3x+l),
(88)x-2.5=(x-1.8)x2
(84)1()X=3(2X+17)+45,
(89)12+(x・12)xl+lx=x
52
(85)5.7(X-0.2)=5.1(X+0.6)+4,
(90)3(X-3)+4(3X-2)=7(2-X),
(86)(3x+4)+x=7(x-5)
(91)
3X-2_2X+3_3X+2_2
2~,
4L8x+—=8>
5
].8x+S-E=8-g
555
1.8x=7.2,
1.8x4-1.8=7.24-1.8,x=4
(6)X+(3X-16)4-1=10(X+l),
4
X+(3X-16)x4=10X+10,X+12X-64=10X+10,13X-64=10X+I0,
13X-64+64=10X+10+64,13X=10X+74,
13X-10X=10X+74-10X,3X=74,3X4-3=744-3,
X工
3
(7)-?
x+l=-x+3,
22
3111
-x+1--x=-x+3--x,
2222
x+l=3,
x+1-1=3-1,x=2
(8)6(3x-2)-4(4x-3)=1-8x,
18x-12-16x+12=l-8x,18x・16x+8x=0,
10x=l,x=R10,
(9)4(x-2)+20x.4=5(1-2x),
4x-8+20x-4=5-lOx,
24x+l()x=5+12,
34x=17,
x=17+34,
2
(10)1.6小(x-0.45)=5,
x-0.45=1.6+5,
x-0.45=0.32,x=0.32+0.45,x=0.77;
小学复杂方程专91题参考答案:
(1)2x+5=5x-7,
2x+5-2x=5x-7-2x,
3x-7=5,
3x-7+7=5+7,
3x=12,
3x《3=12+3,
x=4;
(2)3(x-2)=2-5(x-2),
3x-6=12-5x,
3x-6+5x=I2-5x+5x,
8x-6=12,
8x-6+6=12+6,
8x=18,
8x4-8=184-8,
x=2.25;
⑶些公=],
46
v+22y~3
(匕艄・——)x24=lx24,
46
6(y+2)-4(2y-3)=24,
30-2y=24,
30・2y+2y=24+2y,
2y+24=30,
2y+24-24=30-24,
2y=6»
2y+2=6+2,
y=3
(4)54-(X+16.81)
5
5+(X+16.81)x(X+16.81)旦x(X+16.81),
5
-X(X+16.81)=5,
5
-X(X+16.81)x5=5x5,
5
X+16.81=25,
X+16.81-16.81=25・16.81,
x=8.19
、4?
(5)().2x+-=8-1-x,
55
4333
0.2x+-+i-x=8-i-x+l-x,
5555
—x+0.4-—x=—x-0.1-—x,
15151215
172803128
——xx——=2——x——,
28174417
x=9
x=4-^-
11
(15)5X+7.25=12--2.5X,
4
5X+7.25+2.5X=12--2.5X+2.5X,4
7.5X+7.25=12-,4
7.5X+7.25-7.25=12--7.25,
4
7.5X=5,
7.5X+7.5=5+7.5,
3
(16)2(x+2)-3=3x-5,
(20)2x-^=8+x,
3
(2x-—)x3=(8+x)x3,
3
5x-2=24+3x,
5x-2-3x=24+3x-3x,
2x-2=24,
2x-2+2=24+2,
2x=26,
2x+2=26+2,
x=13
(21)8(x-2)=2x+7,
8xT6+16=2x+7+16,
8x=2x+23,
ix+x=1F-x+x>
8x-2x=2x+23-2x,
6x=23,
6x《6=23+6,
x=3-
6
(22)6(x-3.5)=17.8+2x,
y.186
7
6x-21=17.8+2x,
6x-21-2x=17.8+2x-2x,
(23)
4x・21+21=17.8+21,
4x+4=38.8M,
x=9.7;
(x+16.84)=0.2,
5+(x+16.84)x(x+16.84)=0.2x(x+16.84),
(27)2--(X-().55)=—,
77
2-v(X・0.55)x(X・0.55)=-327
X(X-0.55),7
—X(X-0.55)=—
77
5=0.2x+3.368,
5.3.368=0.2x+3.368.3.368,
孕暮,
i
l.632J).2=().2xJ).2,
r
X-0.55=—,
x=8.16;
32
X-0.55+0.55=0.46875+0.55,
(24)
(9+X):
(9・X)=5:
3,
X=1.01875;
3(9+X)=5(9-X),
5
5
5x+5()-50=60-5()
-X+-
—=42-X,
5x=10
5
5
5x4-5=104-5
家丝
55
丝42-X,
55
x=2
(31)-(28-2x)=6(x-5)
5x+50=60
99
VX+12x442-X,
913
—・-x=6x-30
24
913
—+30=6x+-x
24
2?
x-81
42
27xx4814
427227
x=6
(32)644-(2x-5)=32
64-r(2x-5)x(2x-5)=32x(2x-5)
64x=160+64
64x=224
64x4-64=2244-64
x=3.5
(33)81x・342=76x(x-2)
81x-342=76xX-152
8lx-76x=342-152
5x=190
5x4-5=1904-5
x=38
(34)1-^(x-45%)=2.8,
5
1.44-(X-0.45)=2.8,
x-0.45=1.4+2.8,
x-0.45=0.5»
x・0.45+0.45=0.5+0.45,
x=0.95
(35)5(X+4)=26.6-X,
5x+20+x=26.,6-x+x,
6x+20-20=26.6-20,
6x+6=6.6+6,
(36)100x0.5+(x-100)x0.4=0.48x
0.4x+10=0.48x
0.4x+10-0.4x=0.48x-0.4x
0.08x=10
0.08x4-0.08=104-0.08
x=125.
(37)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
(38)-(x+2)=x+l
§x+旦x+]
42
3」33X13
—x+—-—=x+1-—
4222
3X_X_1
42
3313
—X-—X=X-—-—X
4424
_xx4=—x4
42
x=2
(39)76(x-2)=52x-32
76x-152=52x-32
76x・152+152=52x-32+152
76x=52x+120
76x-52x=52x+120-52x
24x=120
24x^24=12(K24
x=5.
(40)81x-342=76(x-2)
81x-342=76x-152,
81x-342+342=76x-152+342,
81x=76x+190
81x・76x=76x+190-76x
5x=190
5x^5=190+5
x=38
(41)3(2-x)+5(4x-3)=4(x+1)
6-3x+20x-15=4x+4
17x-9=4x+4
17x-4x+9-9=4x-4x+4+9
13x=13
13x4-13=134-13
x=l;
(42)15-(5.5-x)=2x
15-5.5+x=2x
2x-x=9.5
x=9.5;
(43)16+x=12+2x+x
16+x=12+3x
3x-x=16-12
2x=4
x4-2=44-2
x=2
(44)2(x-4)=3(x-12)
2x・8=3x-36
2x-8-2x=3x-2x-36
-8=x-36
-8+36=x-36+36
x=28;
(45)0.4。
(4-x)=14-4
(4-x)4
1.6=4-x
1.6+x=4-x+x
1.6+x=4
1.6+x-1.6=4-1.6
x=2.4;
(46)8(x-2)=2(x+7),
8x・16=2x+14,
8x-16-2x=2x+14-2x,
6x-16+16=14+16,
6x+6=30+6,
x=5
(47)30%x+85=70%x+25,
0.3x4-85-0.3x=0.7x+25-().3x,
0.4x4-25=85,
0.4x+25-25=85-25,
0.4x=60,
0.4x4-0.4=604-0.4,
x=15();
(48)8.5xl.2・5.3x=8.5-4x
10.2-5.3x=8.5-4x
10.2-5.3x+5.3x-8.5=8.5-4x+5.3x-8.5
l.3x=1.7
1.3x7.3=1.7!
1.3
13
(49)5x-2(3-2x)=16x-23
5x-6+4x=16x-23
9x-6=16x-23
9x-6-9x+23=16x-23-9x+23
7x=17
7x^7=174-7
x=H
7
(50)(x-5)x5-9=(x-12)xl2
5x-25-9=12x-144
5x-34=12x-144
5x-34-5x+144=12x-144-5x+144
7x=110
7x+7=110+7
炉地
7
(51)(10-x)-r2=5x-7
10-x=10x-14
10-x+x+14=10x-14+X+14
11x=24
11x71=2471
u
(52)2.7x-1.8=1.2x+2.7,
2.7x-l.8+l.8=1.2x+2.7+l.8,
2.7x-1.2x=1.2x+4.5-1.2x,
1.5x7.5=4.5。
1.5,
x=3;
(53)8-5(6x+0.7)=10x+0.5,
8-30x-3.5=10x+0.5,
4.5・30x+30x=10x+0.5+30x,
4.5-0.5=40x-0.5,
4^40=40x4-40,
x=0.1;
(54)8.5x・3.9x=55.2(x-18),
4.6x=55.2x-993.6,
4.6x-4.6x=55.2x-993.6-4.6x,50.6x-993.6=0,
50.6x-993.6+993.6=993.6,
50.6x=993.6,
50.6x4-50.6=993.64-50.6,
■■
x=19.63;
(55)122-x-19=(x-19)x5,
103-x=5x-95,
103-x+x=5x-95+x,103+95=6x-95+95,198-r6=6x-r6,
x=33;
(56)3.5x+2=4x-1,
2+l=0.5xT+l,
3《0.5=0.5x+0.5,
x=6
(57)
3.51.5
3.5(X-16)=1.5X,
3.5X-56=1.5X
3.5X-56+56=1.5X+56
3.5X-1.5X=56
2X=56
X=28,
(58)X+(3X-16)4-25%=1()(X+l)
X+(3X-16)x4=10X+10
X+3Xx4-16x4=10X+10
13X・64=10X+10
13X-64+64=10X+10+64
13X=10X+74
13X-10X=10X+74-10X
3X=74
(59)75-r(x+10)=2,
754-(x+10)x(x+10)=2x(x+10),
2x+20=75,
2x+20.20=75.20,
2x=55,
2x《2=55+2,
x=27.5;;
(60)5x-3x(28-x)=12+2x,
8x-84=12+2x,
8x-84+84=12+2x+84,
8x=96+2x,
8x-2x=96+2x-2x,
6x=96,
6x+6=96+6,
x=16
(61)6(x+l)=0.5(lOx+16),
6x+6=5x+8,
6x+6-6=5x+8-6,
6x-5x=5x+2-5x,
x=2
5x+10=4x+36,
5x-4x=36-10,
x=26;
(63)127$(2x+3)=15,
127.5+(2x+3)x(2x+3)=15x(2x+3),
15x(2x+3)=127.5,
15x(2x+3)+15=127.5+15,
2x+3=8.5,
2x+3-3=8.5-3,
2x=5.5,
2xt2=5.5-t2,x=2.75;
(64)3(x+2)=4(x+l),
3x+6=4x+4,
3x+6-3x=4x+4-3x,
x+4=6,
x+4-4=6-4,
x=2;
(65)8(x-1.5)=x+0.6>
8xT2=x+0.6,
8x-12+12=x+0.6+12,
8x=x+12.6,
8x-x=x+12.6-x,
7x=12.6,
7x4-7=12.64-7,
x=1.8;
(66)7(x+6)-3x=4(2x+5),
7x+42-3x=8x+20,
4x+42=8x+20,
4x+42-4x=8x+20-4x,
4x+20=42,
4x+20-20=42-20,
4x=22,
4x-i-4=22-r4,
x=5.5;
(67)4x-2(5.5-x)=3.5x・8,
4x-1l+2x=3.5x-8,
6x-11=3.5x-8,
6x-ll+ll=3.5x-8+11,
3.5x+3=6x,
3.5x+3-3.5x=6x-3.5x,
2.5x=3,
(62)5(x+2)=4(x+9),
2.5x4-2.5=34-2.5,
x=1.2
(68)2.8x=19.32-6.4x,
2.8x+6.4x=19.32-6.4x+6.4x,9.2x=19.32,
9.2x+9.2=19.32+9.2,
x=2.1;
(69)5(y-4)-7(7-y)-9=12-3(9-y),
5y-20-49+7y-9=12-27+3y,
12y-78=3y・15,
12y・78+78=3y・15+78,
12y-3y=3y+63-3y»
9y=63,
9y《9=63+9,
y=7
(70)35(x-2)-15(5x-6)=22x-63-21(3x-4),
35x-70-75x+90=22x-63-63x+84,
35x-75x-22x+63x=-63+84-90+70,
x=l
(71)2.6x=51.6・3.4x,
2.6x+3.4x=51.6-3.4x+3.4x,
6x=51.6,
6x4-6=51.6-5-6,x=8.6;
(72)3(4x-2)-2(3x+3)=9-8x,
6x-12=9-8x,
6x-12+8x=9-8x+8x,
14x・12=9,
14x-12+12=9+12,
14x=21,
14x74=21+14,
x=l.5;
(73)20+4x=6x-24,
20+4x-4x=6x-24-4x,
2x-24=20,
2x-24+24=20+24,
2x=44,
2x+2=44+2,x=22;
(74)5(x-1)=x+l,
5x-5=x+l,
5x-5-x=x+l-x,
4x-5=1,
4x-5+5=1+5,
4x=6,
4x+4=6+4,x=1.5;
(75)3(3x-2)=10-0.5(x-3.5),
9x-6=11.75-0.5x,
9x-6+0.5x=l1.75-0.5x+0.5x,
9.5x-6=11.75,
9.5x-6+6=11.75+6,
9.5x=17.75,
9.5x+9.5=17.75+9.5,
x竺.
A9
38
(76)0.4(x-0.2)+1.5=0.7x-0.38,
0.4x+1.42=0.7x-0.38,
0.4x+1.42-0.
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