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)(
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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) |
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)=-a2-a+1. |
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