1、47*65%+0.65*53
=47×0.65+0.65×53
=0.65×(47×53)
=0.65×100
=65
2、4.8/〖2.5*(1—40%)+0.9〗
=4.8/(2.5×60%+0.9)
=4.8/(1.5+0.9)
=4.8/2.4
=2
1、47*65%+0.65*53
=47×0.65+0.65×53
=0.65×(47×53)
=0.65×100
=65
2、4.8/〖2.5*(1—40%)+0.9〗
=4.8/(2.5×60%+0.9)
=4.8/(1.5+0.9)
=4.8/2.4
=2