计算(1)(-7x2y)(2x2y-3xy3+xy)(2)(-5x+32)(-5x-1.5)(3)(x4y+6x3y2-x2y3)÷(3x2y)-数学

题目简介

计算(1)(-7x2y)(2x2y-3xy3+xy)(2)(-5x+32)(-5x-1.5)(3)(x4y+6x3y2-x2y3)÷(3x2y)-数学

题目详情

计算
(1)(-7x2y)(2x2y-3xy3+xy)             
(2)(-5x+
3
2
)(-5x-1.5)

(3)(x4y+6x3y2-x2y3)÷(3x2y)
题型:解答题难度:中档来源:不详

答案

(1)原式=-(14x4y2-21x3y4+7x3y2)
=-14x4y2+21x3y4-7x3y2;

(2)原式=(-5x+class="stub"3
2
)(-5x-class="stub"3
2
)

=25x2-class="stub"9
4


(3)原式=class="stub"1
3
x2+2xy-class="stub"1
3
y2.

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