设f(n)=1-(1/(2*2))+(1/(3*3))-(1/(4*4))…… +(-1)^(n-1) * (1/(n*
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public class F {

public static void main(String[] args) {

System.out.println(f(10));

}

public static float f(int n){

float d=0.0f;

for(int i=1;i

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