整式的乘法
(1)2a^2b•(a+2b-1)(2)(-3/1xy)(12xy^2-6x^2y)(3)-2x^3(3x^2-5x-6)(4)(-2xy)^2•...
(1)2a^2b•(a+2b-1)
(2)(-3/1xy)(12xy^2-6x^2y)
(3)-2x^3(3x^2-5x-6)
(4)(-2xy)^2•(-xy+2x^2y) 展开
(2)(-3/1xy)(12xy^2-6x^2y)
(3)-2x^3(3x^2-5x-6)
(4)(-2xy)^2•(-xy+2x^2y) 展开
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