x^2-y^2-2x+14(x+y)^2-4(x+y)+1
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x^2-y^2-2x+14(x+y)^2-4(x+y)+1
x^2-y^2-2x+1
4(x+y)^2-4(x+y)+1
x^2-y^2-2x+14(x+y)^2-4(x+y)+1
x^2-y^2-2x+1
= (x^2 -2x +1) - y^2
= (x-1)^2 - y^2
=(x-1+y)(x-1-y)
4(x+y)^2-4(x+y)+1
=[2(x+y)-1]^2
=(2x+2y-1)^2
能说得清楚一点吗
1. = X ^2-2X+1-Y^2 =(X-1)^2-Y^2 =(X-1-Y)(X-1+Y)
2. =[2(x+y)]^2-4(x+y)+1 = [2(x+y)-1]^2
x^2-y^2-2x+1=(x^2-2x+1)-y^2=(x-1)^2-y^2=(x+y-1)(x-y-1)
4(x+y)^2-4(x+y)+1=[2(x+y)]^2-1
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