因式分解:(a+1)^2-4(a+1)(a-1)+3(a-1)^2=_______拜托各位大神因式分解:(a+1)^2-4(a+1)(a-1)+3(a-1)^2=_______快快!

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因式分解:(a+1)^2-4(a+1)(a-1)+3(a-1)^2=_______拜托各位大神因式分解:(a+1)^2-4(a+1)(a-1)+3(a-1)^2=_______快快!

因式分解:(a+1)^2-4(a+1)(a-1)+3(a-1)^2=_______拜托各位大神因式分解:(a+1)^2-4(a+1)(a-1)+3(a-1)^2=_______快快!
因式分解:(a+1)^2-4(a+1)(a-1)+3(a-1)^2=_______拜托各位大神
因式分解:(a+1)^2-4(a+1)(a-1)+3(a-1)^2=_______快快!

因式分解:(a+1)^2-4(a+1)(a-1)+3(a-1)^2=_______拜托各位大神因式分解:(a+1)^2-4(a+1)(a-1)+3(a-1)^2=_______快快!
(a+1)^2-4(a+1)(a-1)+3(a-1)^2 a+1 -3(a-1) a+1 -(a-1) =[a+1-3(a-1)][a+1-(a-1)] =(-2a+4)(2) =-4(a+2)