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2. 1,8 + (0,48 - 2,25) - 0,3 = 1,8 + (-1,77) - 0,3 = 1,8 + -2,07 = - 0,27
4. 5l = 65 km
1 km = 5/65 = 1/13
1/13 × 156 = 12 liter