1+x=1.6 25%x-9%x=48 3.2:x=:
1+25%=
100×50%=
1÷10%=
100×10%=
1-70%=
35×40%=
1÷25%=
15÷30%=
①x÷ =
②x﹣ x=4.2
③ x÷2=
④x∶ =