输入
…
1
2
3
4
5
输出
x
?
y
12
24
17.2+2.8=
0.6×0.9=
8÷0.8=
0.25a+0.5a=
123÷100=
0.74×100=
2.7÷3=
3-1.48=
0.25a+0.05×2=
- = + = 4÷3= + =
+ = 1- = 0.2²= - =