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X的三分之二次方等于九 求X的值
人气:335 ℃ 时间:2019-08-19 03:50:31
解答
x^(2/3)=9
[x^(1/3)]^2=3^2
x^(1/3)=3或x^(1/3)=-3
x=3^3或x=(-3)^3
x=27或x=-27
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