ГДЗ Математика 8 клас Істер (2025) - 1 ЧАСТИНА

Перетворіть на дріб вираз:

1) 2x/3 + (x-4)/5 = (10x+3x-12)/15 = (13x-12)/15;
2) (4m-2n)/10 – (m-n)/5 = (4m-2n-2(m-n))/10 = (4m-2n-2m+2n)/10 = 2m/10 = m/5;
3) (a+2)/4a – (3-7a)/6a = (3(a+2)- 2(3-7a))/12a = (3a+6-6+14a)/12a = 15a/12a = 11/4;
4) (2-3y)/y – (5-3x)/x = (x(2-3y)- y(5-3x))/xy = (2x-3xy-5y+3xy)/xy = (2x-5y)/xy;
5) (x+7)/5x – (3y+4)/15y = (3y(x+7)- x(3y+4))/15xy = (3xy+21y-3xy-4x)/15xy = (21y-4x)/15xy;
6) (4a+b)/2a + (a-6b)/3b = (3b(4a+b)+ 2a(a-6b))/6ab = (12ab+3b^2+ 2a^2- 12ab)/6ab = (3b^2+ 2a^2)/6ab.