题目内容
(1)3x2-24x+48
(2) 3a+(a+1)(a-4)
(1)3(x-4)
(2)(a+2)(a-2)
(1)原式=3(x2-8x+16)=a2-4=3(x-4).
(2)原式="3a+a2+a-4a-4="a2-4="(a+2)(a-2).
(2)(a+2)(a-2)
(1)原式=3(x2-8x+16)=a2-4=3(x-4).
(2)原式="3a+a2+a-4a-4="a2-4="(a+2)(a-2).
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