因式分解:(1)(a-b)²-4(b-a)+4(2)2mn-m²-n²(3)1/4 y²+y+1(要过程)
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因式分解:(1)(a-b)²-4(b-a)+4(2)2mn-m²-n²(3)1/4 y²+y+1(要过程)
因式分解:(1)(a-b)²-4(b-a)+4(2)2mn-m²-n²(3)1/4 y²+y+1(要过程)
因式分解:(1)(a-b)²-4(b-a)+4(2)2mn-m²-n²(3)1/4 y²+y+1(要过程)
1) =(a-b)²+4(a-b)+4=((a-b)+2)²=(a-b+2)² 2)=-(m²-2mn+n²)=-(m-n)² 3) 1/4(y²+4y+4)=1/4(y+2)²