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数学
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3xy^2-|2x^2y-[3xy^2-(4xy^2-2x^2y)]|,其中x=3,y=3/2
化简、求值
人气:361 ℃ 时间:2020-04-02 09:24:34
解答
3xy^2-|2x^2y-[3xy^2-(4xy^2-2x^2y)]|,
=3xy²-(2x²y-3xy²+4xy²-2x²y)
=3xy²-xy²
=2xy²
其中x=3,y=3/2
原式=2×3×(3/2)²
=27/2;
=13.5;
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