分解因式:(x+y)²-4(x+y-1)和16(a+b)²-8(a+b)c+c²
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分解因式:(x+y)²-4(x+y-1)和16(a+b)²-8(a+b)c+c²
分解因式:(x+y)²-4(x+y-1)和16(a+b)²-8(a+b)c+c²
分解因式:(x+y)²-4(x+y-1)和16(a+b)²-8(a+b)c+c²
(x+y)²-4(x+y-1)=(x+y)²-4(x+y)+4=(x+y-2)²
16(a+b)²-8(a+b)c+c²=[4(a+b)]²-8(a+b)c+c²=[4(a+b)-c]²=(4a+4b-c)²