(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

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(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

(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
(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

(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
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 (x²-1)=5x 4-5x²
(4)(2x+y-1)²=4x²+y²+1+4xy-2y-4 x=4x²+4xy-4 x-2y+y² +1