1. a) -28+12.7 = b) -21+84:7= v) -11.7+42= 2) 19.4-48 =

1. Вычислим:

a) $$-28+12 \cdot 7 = -28 + 84 = 56$$

б) $$-21 + 84:7 = -21 + 12 = -9$$

в) $$-11 \cdot 7 + 42 = -77 + 42 = -35$$

2) $$19 \cdot 4 - 48 = 76 - 48 = 28$$