24÷7/12-24×5/7=24×12/7-24×5/7=24×(12/7-5/7)=24×1=2462÷(3/8+2/5)×1/4=62÷(15/40+16/40)×1/4=62÷31/40×1/4=62×40/31×1/4=20(2-1/2)÷(11/12-3/4)=(4/2-1/2)÷(11/12-9/12)=3/2÷1/6=3/2×6=9(1/4+1/...