1+2%=
6.5+0.35=
4.2÷0.2=
25%×8=
①:=x: ②-0.5x= ③=
5×π=
5÷=
1÷5%=
0.42=
×8÷×8=
2.4×5=
0.3÷6=
456+44=
0.33=
+79×=