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(-x)³·x^2n-1+x^2n·(-x)²
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C语言 f(x)=1+x+x^2/2!+x^3/3!+...+x^n/n!直到|x^n/n|
f(x)=1*x^0+2*x^1+.+n*x^(n-1)+.怎么计算?