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初中数学 (1)3x^2-27=( ) (2)(a-1)x^2+(1-a)y^2=( )
人气:194 ℃ 时间:2020-06-22 05:14:14
解答
(1)3x^2-27
=3(x^2-9)
=3(x+3)(x-3)
(2)(a-1)x^2+(1-a)y^2
=(a-1)(x^2-y^2)
=(a-1)(x+y)(x-y)
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