5.6+2.98=8.58, 0.24÷0.3=0.8, 12.5%×8=1, 398÷82≈5, 15.4-(5.4-4.5)=14.5,
1-
3
4 =
1
4 ,
1
4 +
5
6 =
13
12 ,
2
9 ÷
4
3 =
1
6 , 603×98.5≈60000,
2
5 ×5=2.
5.6+2.98=8.58, 0.24÷0.3=0.8, 12.5%×8=1, 398÷82≈5, 15.4-(5.4-4.5)=14.5,
1-
3
4 =
1
4 ,
1
4 +
5
6 =
13
12 ,
2
9 ÷
4
3 =
1
6 , 603×98.5≈60000,
2
5 ×5=2.