ГДЗ Математика 8 клас Істер (2025) - 1 ЧАСТИНА

Подайте у вигляді дробу:

1) 7a/4x – 3a/4x = 4a/4x = a/x;
2) (x+y)/8 – (x-3y)/8 = (x+y-(x-3y))/8 = (x+y-x+3y)/8 = 4y/8 = y/2;
3) (a+4)/9 + (5-a)/9 = (a+4+5-a)/9 = 9/9 = 1;
4) (x+3y)/10 + (4x+7y)/10 = (x+3y+4x+7y)/10 = (5x+10y)/10 = (5(x+2y))/10 = (x+2y)/2;
5) (5m-2)/8m – (m-10)/8m = (5m-2-(m-10))/8m = (5m-2-m+10)/8m = (4m+8)/8m = (4(m+2))/8m = (m+2)/2m;
6) (7a+13)/6a + (17-a)/6a = (7a+13+17-a)/6a = (6a+30)/6a = (6(a+5))/6a = (a+5)/a.