144/5÷[7.8+0.625×(12/4－1.15)]= 144/5÷[7.8+5/8×(3－1.15)]= 144/5÷(7.8+5/8×185/100)=144/5÷(78/10+37/32)=144/5÷(78/10+37/32)=144/5÷2866/320=144/5×320/2866=4608/1433