1-
2
15 =
13
15 , 12-12×0.1=10.8,
1
2 -
1
3 =
1
6 , 0.3+
7
10 =1, 1.66÷2=0.83,
1
4 +
3
10 =
11
20 , 7-
5
7 =6
2
7 , 2 3+5 2=33,
4
5 -0.75=0.05, 50×25×1.2=1500.
1-
2
15 =
13
15 , 12-12×0.1=10.8,
1
2 -
1
3 =
1
6 , 0.3+
7
10 =1, 1.66÷2=0.83,
1
4 +
3
10 =
11
20 , 7-
5
7 =6
2
7 , 2 3+5 2=33,
4
5 -0.75=0.05, 50×25×1.2=1500.