2(x+3) / 5 = 3/2x-2(x-7) / 3x-2 /0.2 - x+1 /0.5 =31/2[x-1/2(x+1)]=2/3(x-1)30%x+70%(200-x)=200×54%
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2(x+3) / 5 = 3/2x-2(x-7) / 3x-2 /0.2 - x+1 /0.5 =31/2[x-1/2(x+1)]=2/3(x-1)30%x+70%(200-x)=200×54%
2(x+3) / 5 = 3/2x-2(x-7) / 3
x-2 /0.2 - x+1 /0.5 =3
1/2[x-1/2(x+1)]=2/3(x-1)
30%x+70%(200-x)=200×54%
2(x+3) / 5 = 3/2x-2(x-7) / 3x-2 /0.2 - x+1 /0.5 =31/2[x-1/2(x+1)]=2/3(x-1)30%x+70%(200-x)=200×54%
2(x+3) / 5 = 3/2x-2(x-7) / 3
12x+36=45x-20x+140
13x=-104
x=-8
x-2 /0.2 - x+1 /0.5 =3
少了括号表示
(x-2)/0.2-(x+1)/0.5=3
5x-10-2x-2=3
3x=15
x=5
1/2[x-1/2(x+1)]=2/3(x-1)
1/2(x-1/2x-1/2)=2/3x-2/3
1/4x-1/4=2/3x-2/3
x=0
30%x+70%(200-x)=200×54%
0.3x+140-0.7x=108
-0.4x=-32
x=80
(1)2(x+3) / 5 = 3/2x-2(x-7) / 3
等式两边同*30
得 12(X+3)=45X-20(X-7)
12X+36=45X-20X+140
13X=104
X=8
(2)(x-2) /0.2 -...
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(1)2(x+3) / 5 = 3/2x-2(x-7) / 3
等式两边同*30
得 12(X+3)=45X-20(X-7)
12X+36=45X-20X+140
13X=104
X=8
(2)(x-2) /0.2 -(x+1)/0.5 =3
5(x-2)-2(x+1)=3
5x-10-2x-2=3
3x=15
x=5
(3)1/2[x-1/2(x+1)]=2/3(x-1)
等式两边同*12
6x-3(x+1)=8(x-1)
6x-3x-3=8x-8
x=1
(4)30%x+70%(200-x)=200×54%
等式两边去%
30x+70(200-x)=200*54
3x+7(200-x)=20*54
3x+1400-7x=1080
4x=320
x=80
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