0,5c+5d=0,5(c+2,5d)
-3n-1.8m=-0,6(5n+3m)
1.2n-1.8m=0,6(2n-3m)
-5p+2.5k-0.5t=-0,5(10p-5k+t)
-8p-10k-6t=-2(4p+5k+3t)
3×6=18(руб.)- стоит ручка.
3+18=21( руб.)- за обе вещи.
(-5 + 9 : (-9)) * 2 + 9 = (-5 + (-1))* 2 + 9 = -6 * 2 + 9 = -12 + 9 = - 3
-59 + (3 - 50 : 5) * 3 = -59 + ( 3 - 10) * 3 = - 59 + (-7) * 3 = -59 - 21 = -78
(-97 - 7 * (-5) - 28) : 9 = (-97 + 35 - 28) : 9 = -90 : 9 = - 10