来自胡鹏涛的问题
(未知数-0.5)的3幂;+10的负3次幂=0,则这个未知数等于什么
(未知数-0.5)的3幂;+10的负3次幂=0,则这个未知数等于什么
1回答
2020-06-07 22:22
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胡卫东
(x-0.5)的3幂+10的负3次幂=0
则(x-0.5)³+0.1³=0
则(x-0.5+0.1)[(x-0.5)²-(x-0.5)+0.1²]=0
所以x-0.5+0.1=0
解得x=0.4
2020-06-07 22:25:59
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