7π=
1.22=
×
800×12.5%=
3.14×5=
210÷70%=
1÷×9=
×÷×=
3.5÷=
÷=
1÷0.25=
1÷=
0.3²×3.14=
+×7=
0.75:=
××2.7=
①36×()
②1.3×37.5%+2.7×
③ [()]
④13÷()×
X
6
12
18
24
30
...
y
15
10
7.5