(a-4)(a-3)-(a-1)(a-3)化简因式分解

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(a-4)(a-3)-(a-1)(a-3)化简因式分解
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(a-4)(a-3)-(a-1)(a-3)化简因式分解
(a-4)(a-3)-(a-1)(a-3)化简因式分解

(a-4)(a-3)-(a-1)(a-3)化简因式分解

=(a-3)(a-4-a+1)=-3(a-3)

3(a-3)