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4x^2=25,27x^3=-8两道题X是多少
人气:314 ℃ 时间:2020-04-21 06:43:59
解答
4x^2 = 25
x^2 = 25/4 = (5/2)^2
x = ±5/2
27x^3 = -8
x^3 = -8/27 = (-2/3)^3
x = -2/3
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