算一算。
$4.5+1.1=$
$5.9-2.3=$
$11.7-0.4=$
$3.6+5.2=$
$15.2+12.3=$
$16.9-3.7=$
$2.5+7.4=$
$3.06+1.83=$
$18.8-12.5=$
$6.7+2.2=$
$5.4+3.01=$
$31.5+12.1=$
$8.3+1.6=$
$7.8-2.1=$
$50.7+16.2=$
$3.8-0.2=$
$16.9-3.8=$
$19.1+20.8=$
$9.41-1.1=$
$200.9-100.3=$
$24.6+34.3=$
$9.7-5.5=$
$7.7-6.6=$
$51.5+27.1=$
$0.7+1.08=$
$4.98-1.67=$
$29.21+30.36=$
$7.45+2.5=$
$13.71-12.71=$
$69.77+20.21=$

1. 5.6
2. 3.6
3. 11.3
4. 8.8
5. 27.5
6. 13.2
7. 9.9
8. 4.89
9. 6.3
10. 8.9
11. 8.41
12. 43.6
13. 9.9
14. 5.7
15. 66.9
16. 3.6
17. 13.1
18. 39.9
19. 8.31
20. 100.6
21. 58.9
22. 4.2
23. 1.1
24. 78.6
25. 1.78
26. 3.31
27. 59.57
28. 9.95
29. 1
30. 89.98

算一算。
1.2−0.9=
5.3+1.8=
6.27+1.45=
3.9+4.8=
8.7−3.9=
14.57−12.81=
4.6−3.7=
2.1−0.9=
0.7+0.8=
12.5−11.6=
3.4+0.6=
6.6−1.9=
27.3+10.7=
1.2+1.9=
3.7+7.3=
11.8−9.4=
10−5.6=
9.1+2.7=
17.1−6.5=
7.6−1.8=
2.34+5.49=
7.4+5.38=
9.26−1.3=
3.2+4.8=
9.4+1.6=
6.8+4.8=
20.2−18.7=
0.4+0.7=
2.5+8.9=
15−6.6=

1. 0.3
2. 7.1
3. 7.72
4. 8.7
5. 4.8
6. 1.76
7. 0.9
8. 1.2
9. 1.5
10. 0.9
11. 4
12. 4.7
13. 38
14. 3.1
15. 11
16. 2.4
17. 4.4
18. 11.8
19. 10.6
20. 5.8
21. 7.83
22. 12.78
23. 7.96
24. 8
25. 11
26. 11.6
27. 1.5
28. 1.1
29. 11.4
30. 8.4