(x+y)²-4(x+y-1)(x²+y²)²-4x²y²(x²+2x)²+2(x²+2x)+1a²-b²-2a+19-6a-6b+a²+2ab+b²

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(x+y)²-4(x+y-1)(x²+y²)²-4x²y²(x²+2x)²+2(x²+2x)+1a²-b²-2a+19-6a-6b+a²+2ab+b²

(x+y)²-4(x+y-1)(x²+y²)²-4x²y²(x²+2x)²+2(x²+2x)+1a²-b²-2a+19-6a-6b+a²+2ab+b²
(x+y)²-4(x+y-1)
(x²+y²)²-4x²y²
(x²+2x)²+2(x²+2x)+1
a²-b²-2a+1
9-6a-6b+a²+2ab+b²

(x+y)²-4(x+y-1)(x²+y²)²-4x²y²(x²+2x)²+2(x²+2x)+1a²-b²-2a+19-6a-6b+a²+2ab+b²
第一道=(x+y)²-4(x+y)+4=(x+y-2)²
第2道=(x²+y²)²-(2xy)²=(x²+y²+2xy)*(x²+y²-2xy)=(x+y)²*(x-y)²
第3道把x²+2x看成整体=(x²+2x+1)²
第4道=(a-1)²-b²=(a-1+b)*(a-1-b)
第5道=(a²+2ab+b²)-6(a+b)+9=(a+b)²-6(a+b)+3²=(a+b-3)²

x+y)²-4(x+y-1) =(x+y)²-2*2(x+y)+4=(x+y-2)²
(x²+y²)²-4x²y² =(x²+y²)²-(2xy)² =(x²+y²-2xy)(x²+y²+2xy)
(x²+2x)...

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x+y)²-4(x+y-1) =(x+y)²-2*2(x+y)+4=(x+y-2)²
(x²+y²)²-4x²y² =(x²+y²)²-(2xy)² =(x²+y²-2xy)(x²+y²+2xy)
(x²+2x)²+2(x²+2x)+1 =(x²+2x+1)²
a²-b²-2a+1 =a²-2a+1 -b²=(a+1)²-b²=(a+1+b)(a+1-b)
9-6a-6b+a²+2ab+b²=9-6a-6b+a²+2ab+b²=3*3-2*3*(a+b)+(a+b)²=(a+b-3)²

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