(1)(-2x²y³)²·(xy)³ (2)(2a+3b)(2a-b)
问题描述:
(1)(-2x²y³)²·(xy)³ (2)(2a+3b)(2a-b)
(3)5x²(x+1)(x-1) (4)(2x+y-1)² 没学过不会做
现在只要第(4)题的答案
答
郭敦顒回答:这是求乘积的展开式.(1)(-2x²y³)²·(xy)³=4x4y6·x³y³=4x7y9(2)(2a+3b)(2a-b)=4a²-2ab+6ab-3b²=4a²+4ab-3b²(3)5x²(x+1)(x-1)= 5x²...