2.
- (48/50) = (48x2)/(50x2) = (96/100) = 0,96
- 7,5 ×16 =7 × 10 + 7 × 6 + 0,5 × 16 = 70 + 42 + 8 = 112 + 8 = 120
- (660/3,3) = (66 × 10) /(33× 0,1) = (66/33) × (10/0,1) = 2 × 100 = 200
- 99 × 72 = (100 × 72 ) - ( 1 × 72) = 7200 - 72 = 7128
- 3,74 × 200 = 3,74 × 100 × 2 = 374 × 2 = 748