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5xy²-{2x²y-[3xy²-(xy²-2x²y)]÷(-1/2xy)
最后那个是“负二分之一xy”. 求化简值.
要完整的过程。
人气:135 ℃ 时间:2020-05-30 11:17:38
解答
=5xy^2-{2x^2y-[3xy^2-xy^2+2x^2y]/(-xy/2)
=5xy^2+{2x^2y-2xy^2-2x^2y}/(xy/2)
=5xy^2-2xy^2/(xy/2)
=5xy^2-4y
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