题解 | #求解立方根#
求解立方根
https://www.nowcoder.com/practice/caf35ae421194a1090c22fe223357dca?tpId=37&tags=&title=&difficulty=&judgeStatus=&rp=1&sourceUrl=%2Fexam%2Foj%2Fta%3FtpId%3D37&gioEnter=menu
num = float(input())
ans = num/3
prev = ans-1
while ans-prev > 0.0001 or ans-prev < -0.0001 :
prev = ans
ans -= ans/3-num/ans/ans/3
print('{:.1f}'.format(ans))
牛顿法，因为收敛速度很快所以用while循环
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