x^4+x^3+x^2+x+1= (x^5-1) / (x-1) = 0
x 不等于1,x^5=1
所以 x^200 = (x^5)^40 = 1
x^4+x^3+x^2+x+1= (x^5-1) / (x-1) = 0
x 不等于1,x^5=1
所以 x^200 = (x^5)^40 = 1
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