1-
2
5 +
3
5 =
6
5 , 9-0.9=8.1, 1÷
3
2 ×
2
3 =
4
9 , 0.5-
1
5 +0.5-
1
5 =0.6,
8.1+
1
4 =8.35, 72÷0.4=180, (
1
4 +
1
3 )×24=14, 7÷
3
4 ×7×
3
4 =49.
1-
2
5 +
3
5 =
6
5 , 9-0.9=8.1, 1÷
3
2 ×
2
3 =
4
9 , 0.5-
1
5 +0.5-
1
5 =0.6,
8.1+
1
4 =8.35, 72÷0.4=180, (
1
4 +
1
3 )×24=14, 7÷
3
4 ×7×
3
4 =49.