因式分解:
(1)aa+3a-4
(2)(xx-3x)(xx-3x)-2xx+6x+1
(3)(a+b)(a-b)-4(b+1)
人气:290 ℃ 时间:2020-02-01 07:54:19
解答
(1)aa+3a-4 =(a-1)(a+4)(2)(xx-3x)(xx-3x)-2xx+6x+1 =(xx-3x)^2-2(xx-3)+1=(xx-3x-1)^2(3)(a+b)(a-b)-4(b+1)=a^2-b^2-4b-4=a^2-(b^2+4b+4)=a^2-(b+2)^2=(a+b+2)(a-b-2)
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