(72-2.4x7.5)÷(5-1.4)=(72-0.6x4x7.5)÷3.6=72÷3.6-0.6x30÷3.6=20-6=14
列式为:(72-2.4×7.5)÷(5-1.4)
(72-2.4x7.5)÷(5-1.4)=15,商是15