运用公式法分解因式,(1)a²-2a(b+c)+(b+c)² (2)4xy²-4x²y-y³(3)-a+2a²-a³
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运用公式法分解因式,(1)a²-2a(b+c)+(b+c)² (2)4xy²-4x²y-y³(3)-a+2a²-a³
运用公式法分解因式,
(1)a²-2a(b+c)+(b+c)²
(2)4xy²-4x²y-y³
(3)-a+2a²-a³
运用公式法分解因式,(1)a²-2a(b+c)+(b+c)² (2)4xy²-4x²y-y³(3)-a+2a²-a³
解(1):
原式=a²-2×a×(b+c)+(b+c)²
=[a-(b+c)]²
=(a-b-c)²
解(2):
原式=4xy²-4x²y-y³
=-y(4x²-4xy+y²)
=-y[(2x)²-2×2x×y+y²]
=-y(2x-y)²
解(3):
原式=-a(1-2a+a²)
=-a(1-a)²
自己做不就行了 笨蛋鐧惧害鍦板浘