40.2*3.9*3/5÷(0.6*39*2.01)
=40.2*3.9*0.6÷(0.6*39*2.01)
=40.2*3.9÷(39*2.01)
=4.02*39÷(39*2.01)
=4.02÷2.01
=2
99*(11分之9-8分之3)+8分之3*99
=99×11分之9 -99×8分之3 +8分之3*99
=9×11×11分之9
=81
40.2*3.9*3/5÷(0.6*39*2.01)
=40.2*3.9*0.6÷(0.6*39*2.01)
=40.2*3.9÷(39*2.01)
=4.02*39÷(39*2.01)
=4.02÷2.01
=2
99*(11分之9-8分之3)+8分之3*99
=99×11分之9 -99×8分之3 +8分之3*99
=9×11×11分之9
=81