能简便
18.75-0.23×2-4.54
=18.75-0.46-4.54
=18.75-(0.46+4.54)
=13.75
4.2+4.2÷2.1÷0.2
=4.2+4.2÷(2.1×0.2)
=4.2+4.2÷0.42
=4.2+10
=14.2
0.5×(0.09+1.29)÷0.23
=0.5×1.38÷0.23
=0.5×6
=3
能简便
18.75-0.23×2-4.54
=18.75-0.46-4.54
=18.75-(0.46+4.54)
=13.75
4.2+4.2÷2.1÷0.2
=4.2+4.2÷(2.1×0.2)
=4.2+4.2÷0.42
=4.2+10
=14.2
0.5×(0.09+1.29)÷0.23
=0.5×1.38÷0.23
=0.5×6
=3