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数学
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(3x-³y-²)²÷9×﹙⅓x²y-¹﹚³
人气:422 ℃ 时间:2020-04-14 09:08:31
解答
[3x^(-3)y^(-2)]^÷9×[(1/3)x^y^(-1)]^3
=9x^(-6)y^(-4)÷9×(1/27)x^6y^(-3)
=(1/27)y^(-7).
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