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- // Суммы. Общие задания 1-7
- // В седьмом номере нужно сократить (?)
- // Summy - 1
- /*#include <stdio.h>
- void main() {
- int i;
- float s=0, a;
- for (i = 1; i <= 100; i++) {
- a = 1.0 / (i*i);
- s += a;
- } printf("%f\n", s);
- }
- // Summy - 2
- #include <stdio.h>
- void main() {
- int i;
- float p=1, a;
- for (i = 1; i <= 5; i++) {
- a = (i*i) / (i*i + 2*i + 3.0);
- p *= a;
- } printf("%f\n",p);
- }
- // Summy - 3
- #include <stdio.h>
- void main() {
- int i, fac=1;
- float a, s=0;
- for (i = 1; i <= 5; i++) {
- fac *= i;
- a = (i + 1.0) / fac;
- s += a;
- } printf("%f\n", s);
- }
- // Summy - 4
- #include <stdio.h>
- void main() {
- int A, B, facA=1, facB=1;
- float b=1, s=0;
- for (A = 1; A <= 4; A++) {
- for (B = 1; B <= 4; B++) {
- facA *= A;
- facB *= B;
- b *= facA / (facB + 3.0);
- }
- s += 2.8 + b;
- facA=1; facB=1; b=1;
- } printf("%f\n", s);
- }
- // Summy - 5
- #include <stdio.h>
- void main() {
- int i, fac=1, x;
- float s=0, a, i2=1;
- for (i = 1; i <= 3; i++) {
- if (i>1)
- fac*=(2*i-2)*(2*i-1);
- i2 *= 2;
- a = fac / i2;
- s += a;
- } printf("%f\n", s);
- }
- // Summy - 6
- #include <stdio.h>
- #include <math.h>
- void main() {
- int k, fac=1;
- float znamen, p=1;
- for (k = 1; k <= 3; k++) {
- if (k > 1)
- fac *= (3*k-3)*(3*k-2)*(3*k-1);
- znamen = 1.0 + sin((double)fac);
- p *= 3.0 / znamen;
- }
- p += 3.2;
- printf("%f\n", p);
- }
- // Summy - 7
- #include <stdio.h>
- void main() {
- int i, n;
- float a, s=0, x, xn=1;
- scanf("%f %d", &x, &n);
- xn = x;
- if ((x > -1) && (x < 1)) {
- a = 1.0 / (1 - x) * (1 - x);
- for (i = 1; i <= n; i++) {
- xn *= xn;
- s += (i + 1) * xn;
- }
- if (i == 1)
- s = 1;
- else s += 1;
- if (a == s)
- printf("true\n");
- else printf("false\n");
- s += 1;
- }
- else printf("x = (-1; 1)\n");
- }*/
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