x^2y-3xy^2+2yx^2-y^x 求解答
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发布时间:2024-10-22 01:17
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热心网友
时间:2024-10-22 02:35
解:
(1)x^2y-3xy^2+2yx^2-y^2x
=(x^2 y+2x^2 y)-(3xy^2 +xy^2)
=3x^2 y-3xy^2
(2)1/4a^2b-0.4ab^2-1/2a^2b+1/5ab^2
=[(1/4)a^2 b-(1/2)a^2 b]-(0.4ab^2 -0.2ab^2)
=(-1/4)a^2 b-0.2ab^2