0.75×18÷0.15
= 0.75÷0.15×18
=3×18
= 542.07÷0.23÷0.45
=9÷0.45
=2021.36÷0.8-12.9
=26.7-12.9
=13.87.28+3.2÷2.5
=7.28+1.28
=8.56