分解因式 (1) (a+b)²+9(a+b)+14 (2)(x-y)²-7(x-y)-18
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分解因式 (1) (a+b)²+9(a+b)+14 (2)(x-y)²-7(x-y)-18
分解因式 (1) (a+b)²+9(a+b)+14 (2)(x-y)²-7(x-y)-18
分解因式 (1) (a+b)²+9(a+b)+14 (2)(x-y)²-7(x-y)-18
十字相乘法
(a+b)²+9(a+b)+14
=(a+b+2)(a+b+7)
(x-y)²-7(x-y)-18
=(x-y-9)(x-y+2)
1、(a+b+2)(a+b+7)
2、(x-y+2)(x-y-9)
(1) (a+b)²+9(a+b)+14
=(a+b+7)(a+b+2)
(2)(x-y)²-7(x-y)-18
=(x-y-9)(x-y+2)