1
=(x-y)²-2(x-y)+1
=(x-y+1)²
2
=a²-b²+4b-4
=a²-(b-2)²
=(a+b-2)(a-b+2)
3
=(3x-3y)²+2(3x-3y)×7+7²
=(3x-3y+7)²
分解因式:(1)(x-y)(x-y-2)+1= (2)(a平方-b平方)+4(b-1)= (3)9(x-y)平方+42(x-y)+49=
分解因式:(1)(x-y)(x-y-2)+1= (2)(a平方-b平方)+4(b-1)= (3)9(x-y)平方+42(x-y)+49=
數(shù)學(xué)人氣:508 ℃時間:2020-05-27 06:01:50
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