36.25-(19.8-3.75)-4.2
=36.25-19.8+3.75-4.2
=36.25+3.75-(19.8+4.2)
=40-24
=16
8分之7*【（5分之4-2分之1）*6分之5】
=7/8 *(24/25 - 3/5)
=7/8* 9/25 =63/200