5.5÷25.5×0.5 1.28÷21.28÷4 8.25÷58.25×5
7.42÷0.77.42 25.9÷0.925.9÷9 15.9÷15 15.9+15
1÷0.25= 15×60= 72×25%=
1.1-0.01= 12÷ =
24×( )=