Решение:
1. \(18+(63:9+5) \cdot 3-(27-81:9-18)+5 \cdot 7 = \)
\(18+(7+5) \cdot 3-(27-9-18)+5 \cdot 7 = \)
\(18+12 \cdot 3-(18-18)+35 = \)
\(18+36-0+35 = 54+35 = 89\)
2. \(72-(54-18 \cdot 2):9+4 \cdot (56:8+33:11) = \)
\(72-(54-36):9+4 \cdot (7+3) = \)
\(72-18:9+4 \cdot 10 = \)
\(72-2+40 = 70+40 = 110\)
3. \(56:4+2 \cdot (120:6-80:20)+24 \cdot 2 = \)
\(14+2 \cdot (20-4)+48 = \)
\(14+2 \cdot 16+48 = \)
\(14+32+48 = 46+48 = 94\)
Ответ:
1. 89
2. 110
3. 94