Вычисли. 1) $$81:9+3 \cdot 7 =$$ 2) $$80-(18+9):9=$$ 3) $$15+6 \cdot (15-8)=$$ 4) $$62 - (29+6):7=$$

1) $$81:9+3 \cdot 7 = 9 + 21 = 30$$ 2) $$80-(18+9):9 = 80 - 27:9 = 80 - 3 = 77$$ 3) $$15+6 \cdot (15-8) = 15 + 6 \cdot 7 = 15 + 42 = 57$$ 4) $$62 - (29+6):7 = 62 - 35:7 = 62 - 5 = 57$$