①
②
③
④
+ = + = - = 1- =
- = 2- = + = 4.4+ =
2 + = 4-1 =
9.5+4.2=
0.8×1.3=
14.1÷3=
=
8.1-2.7=
1.4×0.3=
7.9+0.1=
2.4×5=
5÷4=
过山车9元/人
快乐漂流8元/人
水上电影5元/人
旋转木马6元/人
10﹣0.9= 28+82= 20×5%= +×0=
4.8÷0.8= += ×= 1÷-1=