81（x-1）^3=125
方程兩邊同時除以81得
（x-1）^3=125/81
兩邊同時開三次方得
x-1=5/81^1/3
移項合并同類項得
x=1+5/81^1/3
81（x-1）^3=125
81（x-1）^3=125
數(shù)學(xué)人氣：554 ℃時間：2020-09-15 21:08:04
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