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#include<stdio.h>
int main()
{
    int x=30,y=45,z;
    z=x;
    while(!(x%z==0&&y%z==0))
        z--;
    printf('%d',z);
    return 0;
}

#include<stdio.h>
int main()
{
    int x,y,z;
    for(x=0;x<=20;x++)
        for(y=0;y<=33;y++)
            for(z=0;z<=100;z++)
                if(x+y+z==100&&5*x+3*y+z/3==100&&z%3==0)
                    printf('x=%d,y=%d,z=%d\n');
    return 0;
}

#include<stdio.h>
#include<math.h>
int main()
{
    double s=1,a=1,x,eps;
    int n;
    scanf('%lf%lf',&x,&eps);
    for(n=2;fabs(a)>eps;n++){
        a=a*x/(n-1);
        s+=a;
    }
    printf('%f',s);
    return 0;
)

#include<stdio.h>
#include<math.h>

int main()
{
    double x1=0, x2 = 2;
    while (fabs(cos(x2)-x2)>1e-6&&fabs(x2-x1)>1e-6){
        x1 = x2;
        x2 = x1 + (cos(x1) - x1) / (sin(x1) + 1);
    }
    printf('x=%f\nf(x)=%.6f',x2,fabs(cos(x2)-x2));
    return 0;
}

#include <math.h>
#include <stdio.h>
float f(float x)
{
    float y;
    y = ((x + 2.0) * x - 2.0) * x - 1.0;
    return y;
}

int main()
{
    float x, x1, x2;
    x1 = -1, x2 = 0;
    do{
        x = (x1 * f(x2) - x2 * f(x1)) / (f(x2) - f(x1));
        if (f(x) * f(x1) > 0)
            x1 = x;
        else
            x2 = x;
    } while (fabs(f(x)) >= 1e-6);
    printf('the root is %f\n', x);
    printf('((x+2.0)*x-2.0)*x-1.0=%f\n', f(x));
    return 0;
}

#include<stdio.h>
#include<math.h>
int main()
{
    long n,i;
    double a=-1.57,b=1.57,h,s=0,x;
    scanf('%ld',&n);
    h=(b-a)/n;
    x=a;
    for(i=0;i<n;i++){
        s+=cos(x);
        x+=h;
    }
    printf('%f',s*h);
    return 0;
}