Ответ:
\(8\cdot2=16\); \(7\cdot6=42\); \(9\cdot3=27\); \(8\cdot8=64\); \(63:7=9\); \(18:9=2\); \(21:3=7\); \(42:7=6\).
\(12:2+6=6+6=12\); \((35-8):3=27:3=9\); \(43-4\cdot2=43-8=35\); \(40:5\cdot4+8=8\cdot4+8=40\).
\(8\cdot2=16\); \(7\cdot6=42\); \(9\cdot3=27\); \(8\cdot8=64\); \(63:7=9\); \(18:9=2\); \(21:3=7\); \(42:7=6\).
\(12:2+6=6+6=12\); \((35-8):3=27:3=9\); \(43-4\cdot2=43-8=35\); \(40:5\cdot4+8=8\cdot4+8=40\).