x²-2xy+y²+2x-2y-3怎么推导?
2个回答
x²-2xy+y²+2x-2y-3
=(x²-2xy+y²)+(2x-2y)-3 (先分组)
=(x-y)²+2(x-y)-3 (配方法)
=(x-y+3)(x-y-1) (十字相乘法)
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