一、口算。
3.52 - 1 =
4.9×0.9 =
1.26 + 0.46 =
3.12×100 =
2.08÷4 =
0.6×1.6 =
0.58 + 0.04 =
0.19×0.8 =
1.02 - 0.2 =
5.8÷29 =
7.8 + 3.02 =
0.72÷0.12 =
10.4 - 9.6 =
2.7×3 =
3.65 + 3.85 =
0.8×45 =
7 - 5.08 =
0.06×1.3 =
80÷50 =
0.24×5 =
457 + 13 =
0.25×1.6 =
8.2 - 2.7 =
3.25×4 =
0.81 - 0.32 =
0.18×0.4 =
3 - 0.5 =
4.8 + 0.76 =
7.5÷1.5 =
3.52 + 1.69 =

2.52 4.41 1.72
312 0.52 0.96
0.62 0.152 0.82
0.2 10.82 6
0.8 8.1 7.5
36 1.92 0.078
1.6 1.2 470
0.4 5.5 13
0.49 0.072 2.5
5.56 5 5.21

二、解方程。
0.2x = 3.6
x÷17 = 30
5x = 72.5

x = 18 x = 510 x = 14.5