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数学
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已知A=8x^2y-6xy^2-3xy,B=7xy^2-2xy+5x^2y求A-B
人气:137 ℃ 时间:2019-10-24 10:44:14
解答
=(8x²y-6xy²-3xy)-(7xy²-2xy+5x²y)
=8x²y-6xy²-3xy-7xy²+2xy-5x²y
=(8x²y-5x²y)+(-6xy²-7xy²)+(-3xy+2xy)
=3x²y-13xy²-xy
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