3.62+1.8=5.42,
2
5 ÷
3
20 =2
2
3 , 3.2×
3
4 =2.4, 8×(12+0.5)=100,
39005+2007=41012, 6.08-1.998=4.082, 0.45÷0.9=0.5, 4
1
2 -
1
5 =4
3
10 .
3.62+1.8=5.42,
2
5 ÷
3
20 =2
2
3 , 3.2×
3
4 =2.4, 8×(12+0.5)=100,
39005+2007=41012, 6.08-1.998=4.082, 0.45÷0.9=0.5, 4
1
2 -
1
5 =4
3
10 .