19+23=
5﹣1.6=
0.23÷0.1=
0.4×0.2=
=
÷0.25=
= ﹣0.25= 0÷5=
= 5.4×= 80×0.7=
①:x=:0.75
②6x﹣0.5×5=9.5
①4+0.7x=102
②x﹣+6=16
③x:12.5=8:
④x﹣x=18