七年级上册数学解方程3(y+1) 2(x-2)-3(3x+2)=x+6 3(x-7)-2[9-4(2-x)]=22 x-1/3[x-1/3(x-9)]=1/9(x-9)3(y+1)=(2y-1) 2x-5=7 14x-3(20-x)=5x-3(8-x)
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七年级上册数学解方程3(y+1) 2(x-2)-3(3x+2)=x+6 3(x-7)-2[9-4(2-x)]=22 x-1/3[x-1/3(x-9)]=1/9(x-9)3(y+1)=(2y-1) 2x-5=7 14x-3(20-x)=5x-3(8-x)
七年级上册数学解方程
3(y+1) 2(x-2)-3(3x+2)=x+6 3(x-7)-2[9-4(2-x)]=22 x-1/3[x-1/3(x-9)]=1/9(x-9)
3(y+1)=(2y-1) 2x-5=7 14x-3(20-x)=5x-3(8-x)
七年级上册数学解方程3(y+1) 2(x-2)-3(3x+2)=x+6 3(x-7)-2[9-4(2-x)]=22 x-1/3[x-1/3(x-9)]=1/9(x-9)3(y+1)=(2y-1) 2x-5=7 14x-3(20-x)=5x-3(8-x)
2(x-2)-3(3x+2)=x+6 3(x-7)-2[9-4(2-x)]=22
2x-4-9x-6=x+6 3x-21-2(9-8+4x)=22
8x=-16 3x-21-2-8x=22
x=-2 5x=-45
x=-9
x-1/3[x-1/3(x-9)]=1/9(x-9)
x-1/3(x-1/3x+3)=1/9x-1
x-2/9x-1=1/9x-1
2/3x=0
x=0
3(y+1) 少了东西吧。
X=-2
X=-9
X=0