x2+2xy+y2-9=0 (x-y)2-3(x-y)+2=0
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x2+2xy+y2-9=0(x-y)2-3(x-y)+2=0x2+2xy+y2-9=0(x-y)2-3(x-y)+2=0x2+2xy+y2-9=0(x-y)2-3(x-y)+2=0问什么?2式去括号：
x2+2xy+y2-9=0 (x-y)2-3(x-y)+2=0
x2+2xy+y2-9=0 (x-y)2-3(x-y)+2=0
x2+2xy+y2-9=0 (x-y)2-3(x-y)+2=0
问什么?
2式去括号：2x_2y-3x+3y+2=0得y-x=-2则y=x-2,将y=x-2代入1式:2x+2xx-4+4x-4-9=0.8x的立方=17x=17/8开立方。
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