①x÷=
②x+x=
③x=25
3.5x-2x=9
9.6-5x=2.1
1.6x-1.5=2.1
①x+0.125=
②﹣x=
③+x=2
④x﹣=
- = × = 80÷10%= 42×3.14=
30%+0.45= 3.6÷0.18= 2- = 6- - =