一、口算。
8 - 1.6 =
0.12×8 =
7.92 + 2.08 =
1.9×4 =
0.67 + 1.24 =
0.95×4 =
4.2 - 2.02 =
1÷0.05 =
0.2 - 0.16 =
0.22 + 0.8 =
10 - 2.05 =
0.24÷0.3 =
0.4×2.5 =
0.48÷0.8 =
3.8×0.5 =
1.5 - 0.67 =
2.5×2.4 =
0.88÷0.8 =
0.49 + 2.8 =
0.54÷1.8 =
0.7×2.6 =
0.9×1.1 =
1.78 - 0.7 =
4.8÷0.12 =
1.32 + 2.08 =
33.5÷5 =
1.08 + 2.3 =
0.24×0.5 =
7.5 + 2.5 =
0.72÷0.4 =

6.4 0.96 10
7.6 1.91 3.8
2.18 20 0.04
1.02 7.95 0.8
1 0.6 1.9
0.83 6 1.1
3.29 0.3 1.82
0.99 1.08 40
3.4 6.7 3.38
0.12 10 1.8

二、解方程。
2.8 + 7x = 5.6
0.5x - 2.4 = 2.6
10 + 4x = 10.8

$x = 0.4$ $x = 10$
$x = 0.2$