初一解方程
2016-08-08
展开全部
解方程
①x-1/2[x-1/2(x-1)]=2/3(x-1)
x-1/2(x-x/2-1/2)=2x/3-2/3
x-x/4+1/4=2x/3-2/3
x-x/4-2x/3=-2/3-1/4
12x-3x-8x=-8-3
解得x=-11
②5/6[6/5(x/3-1)-2]-x=1
(x/3-1)-5/3-x=1
x/3-1-5/3-x=1
x/3-x=1+1+5/3
x-3x=3+3+5
-2x=11
解得x=-11/2
③(x+3)/0.2-(0.4x-1)/0.5=-2.5
5(x+3)-2(0.4x-1)=-2.5
5x+15-0.8x+2=-2.5
4.2x=-2.5-17
4.2x=-19.5
解得x=-19.5/4.2=65/14
①x-1/2[x-1/2(x-1)]=2/3(x-1)
x-1/2(x-x/2-1/2)=2x/3-2/3
x-x/4+1/4=2x/3-2/3
x-x/4-2x/3=-2/3-1/4
12x-3x-8x=-8-3
解得x=-11
②5/6[6/5(x/3-1)-2]-x=1
(x/3-1)-5/3-x=1
x/3-1-5/3-x=1
x/3-x=1+1+5/3
x-3x=3+3+5
-2x=11
解得x=-11/2
③(x+3)/0.2-(0.4x-1)/0.5=-2.5
5(x+3)-2(0.4x-1)=-2.5
5x+15-0.8x+2=-2.5
4.2x=-2.5-17
4.2x=-19.5
解得x=-19.5/4.2=65/14
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