计算(1)(x-y)(x+3)(2)(5a2+8a)+(3a2-7a+5)(3)(-3)5•(-3)2(4)x2y2(-x2y)(5)(2a+3b)(a-b)(6)(5a3-2a+a2)÷(-2a)-

题目简介

计算(1)(x-y)(x+3)(2)(5a2+8a)+(3a2-7a+5)(3)(-3)5•(-3)2(4)x2y2(-x2y)(5)(2a+3b)(a-b)(6)(5a3-2a+a2)÷(-2a)-

题目详情

计算
(1)(x-y)(x+3)
(2)(5a2+8a)+(3a2-7a+5)
(3)(-3)5•(-3)2
(4)x2y2(-x2y)
(5)(2a+3b)(a-b)
(6)(5a3-2a+a2)÷(-2a)
题型:解答题难度:中档来源:不详

答案

(1)(x-y)(x+3)=x2+3x-xy-3y;

(2)(5a2+8a)+(3a2-7a+5),
=5a2+8a+3a2-7a+5,
=8a2+a+5;

(3)(-3)5•(-3)2,
=(-3)5+2,
=-37;

(4)x2y2(-x2y)=-x4y3;

(5)(2a+3b)(a-b),
=2a2-2ab+3ab-3b2,
=2a2+ab-3b2;

(6)(5a3-2a+a2)÷(-2a)=-class="stub"5
2
a2-class="stub"1
2
a+1.

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