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設a=2的三次方根,試以a表示(-0.004)的三次方根?
Sol a=2^(1/3) (－0.004)^(1/3) =－(0.004)^(1/3) =－(4/1000)^(1/3) =－4^(1/3)/(1000)^(1/3) =－a^2/10
a=2^(1/3)(-0.004)^(1/3)=-(4/1000)^(1/3)=-(a^2)/10
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