1.53-0.5=
7.8+0.9=
7.5-2.5=
12÷0.4=
0.56+6.44=
356÷100=
5.5×0.1=
1-0.4=
32÷1000=
0.12÷0.2=
1.25×5×8=
2.9+4.7+2.1=
+ = - = + = 1- =
- = + = - = + =
3.14×8=
31.4÷3.14=
16×3.14=
12.56÷3.14=
3.14×64=
100.48÷3.14=
60×3.14=
3.14×202=
够口 不够口