ГДЗ Математика 8 клас Істер (2025) - 1 ЧАСТИНА

Виконайте дію:

1) (2c-7)/2(c+5) + (4-c)/(c+5) = (2c-7+8-2c)/(2(c+5)) = 1/(2(c+5));
2) (a-1)/(3a+6) – a/(4a+8) = (a-1)/(3(a+2)) – a/(4(a+2)) = (4a-4+3a)/(12(a+2)) = (a-4)/(12(a+2));
3) 7/x – 14/(x(x+2)) = (7x+14-14)/(x(x+2)) = 7x/(x(x+2)) = 7/(x+2);
4) 9/(m^2+ 4m) – 5/(m+4) = 9/(m(m+4)) – 5/(m+4) = (9-5m)/(m(m+4));
5) b/(a^2- b^2 ) + 1/(a+b) = b/((a-b)(a+b)) + 1/(a+b) = (b+a-b)/((a-b)(a+b)) = a/(a^2- b^2 );
6) (x+3)/(x^2+ 2x+1) – 1/(x+1) = (x+3-x-1)/((x+1)^2 ) = 2/((x+1)^2 ).