10﹣5.2=
7÷=
4×0.5=
0.52÷0.42=
48÷0.04=
48×25%=
1÷1%=
3.5+6.45=
657﹣298=
2.4×=
562÷79≈
21×498≈
①4:5=x:25
②1+4x=6.7
③3x﹣60%x=4.32
④:3
①6.4×2.5×1.25
②8.5×98%
③÷4+×
④×