3.4*1.25+1.25*4.6
=1.25(3.4+4.6)
=1.25*8
=10
11分之15-7分之3+11分之18-7分之4
=15/11-3/7+18/11-4/7
=(15/11+18/11)-(3/7+4/7)
=33/11-7/7
=3-1
=2
(1-15分之8*2分之1)/5分之4
=(1-8/15*1/2)/(4/5)
=(1-4/15)*(5/4)
=(11/15)*(5/4)
=44/3
1.6*[1÷(2.1-2.09)]
=1.6*[1÷0.01]
=1.6*100
=160