Упростить выражение: а)(с+5.4)-(4.9+с) б) -3*(0.2x+0.4y)+2*(1.6x+2.8y)
1)(с+5.4)-(4.9+с) с+5.4-4.9-с 0,5 2) -3*(0.2х+0.4у)+2*(1.6х+2.8у) -0.6х-1.2у+3.2х+5.6у 2.6х+4.4у
А) (c+5.4)-(4.9+c) = c+5.4-4.9-c = 0.5 Б)3*(0.2x+0.4y)+2*(1.6x+2.8y) = 0.6x+1.2y+3.2x+5.6y = 3.8x+6.8y