题目内容
【题目】计算:
(1)(3x+2y)(9x2-6xy+4y2);
(2)(3x-2y)(y-3x)-(2x-y)(3x+y).
【答案】(1)27x3+8y3;(2)-15x2-y2+10xy
【解析】试题分析:用多项式乘多项式法则计算即可.
试题解析:解:(1)原式=27x3-18x2y+12xy2+18x2y-12xy2+8y3
=27x3+8y3;
(2)原式=3xy-9x2-2y2+6xy-(6x2+2xy-3xy-y2)
=-9x2-2y2+9xy-6x2+xy+y2
=-15x2-y2+10xy.
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