(1)计算:3a(5a-2b) (2)计算:(y+2)(y-2)-(y-1)(y 发布时间:2017-05-16 07:38 │ 来源:www.tikuol.com 题型:解答题 问题: (1)计算:3a(5a-2b)(2)计算:(y+2)(y-2)-(y-1)(y+5)(3)计算:[(2m+n)2-n(4m+n)]÷(-2m)(4)因式分解:6xy2-9x2y-y3
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