Спрости вираз :а)-6а-b+5а-13b;б)(3-2r)-(8-5r);в)-2x*(y-3)+x*(2y+1);г)5/8*(12m-2.2/3)+7/15*(2.1/7m-2.1/6)

a) -6a-b+5a-13b = -a-14bб) (3-2r)-(8-5r) = 3-2r-8+5r = 3r-5в) -2x*(y-3)+x*(2y+1) = -2xy+6x+2xy+x = 6x+x = 7xг) 5/8*(12m-2.2/3)+7/15*(2.1/7m-2.1/6) = 7.5m-8/3+m-91/90 =8.5m-3.31/90.