简便计算
94.5-(15.4+40.37)　　
=94.5-15.4-40.37
=79.1-40.37
=38.77
5.3+62.54-9.27
=67.84-9.27
=58.57
78.13-(21.32-9.57)
=78.13+9.57-21.32
=87.7-21.32
=66.38