(ab-3a的平方)-2b的平方-5ab-(a的平方-2ab),其中a=1,b=-2
(ab-3a的平方)-2b的平方-5ab-(a的平方-2ab),其中a=1,b=-2
数学人气:521 ℃时间:2019-11-21 22:16:26
优质解答
原式=3a^2b+ab^2-3a^2b+5ab-2ab^2=-ab^2+5ab将a=-1,b=2代入上式,可得结果为-6
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