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三次根号下488等于几

1.868

3次根号下5.6438等于1.78.

i=cos(π/2+2kπ)+isin(π/2+2kπ) x^3=i x=cos[(π/2+2kπ)/3]+isin[(π/2+2kπ)/3] k是整数

3.398355606

576的立方根等于8.320(一般取小数点后三位).希望帮到你.

三次根号下-27 等于多少?解:在实数范围内,(-27)^(1/3)=-3;在复数范围内-27=27(cosπ+isinπ) 故(-27)^(1/3)=3{cos[(π+2kπ)/3]+isin[(π+2kπ)/3]},k=0,1,2.当k=0时,(-27)^(1/3)=3[cos(π/3)+isin(π/3)]=3(1/2+i√3/2) 当k=1时,(-27)^(1/3)=3(cosπ+isinπ)=-3 当k=2时,(-27)^(1/3)=3[cos(5π/3)+isin(5π/3)]=3[cos(π/3)-isin(π/3)]=3(1/2-i√3/2)

13.30011872

三次√0.02852≈0.305527

1.199005021

33.172648882073232848834068638512

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