An "Armstrong number" is an n-digit number that is equal to the sum of the nth powers of its individual digits. For example, 153 is an Armstrong number because it has 3 digits and 13+53+33=153. What is the digit k in the Armstrong number 1,6k4?
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k*(k^3-10)=3*17, k=3
同学,请问3*17是代表什么,怎么想到的?是否可以避免手算那么多遍4次方
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