7.34+1又25分之4
=7.34+1.16
=7.5
27分之2×1.8
=2/27×9/5
=2/15
2.8÷1又3分之1
=2.8÷4/3
=21.
1.2×3又7分之4
=1.2×25/7
=30/7
7又5分之3÷0.19
=7.6÷0.19
=40