一、口算。
4 - 1.08 =
0.13×70 =
0.18÷0.6 =
0.65÷13 =
2.85 + 6.15 =
500×0.6 =
2.3 - 0.48 =
10.5×2 =
5.5÷0.11 =
1.3 + 0.26 =
2.08 - 1.64 =
4×0.17 =
0.36÷0.04 =
1.3 + 8.46 =
0.21÷7 =
40×0.15 =
3÷0.6 =
0.8 - 0.45 =
5.6÷1.4 =
9.6 - 1.06 =
5.24 + 3.76 =
20.5 + 2.05 =
630÷21 =
0.7 - 0.35 =
0.6×0.5 =
3.6 + 2.4 =
250×0.4 =
0.9 - 0.57 =
3.99÷3 =
2 + 3.52 =

2.92 9.1 0.3
0.05 9 300
1.82 21 50
1.56 0.44 0.68
9 9.76 0.03
6 5 0.35
4 8.54 9
22.55 30 0.35
0.3 6 100
0.33 1.33 5.52

二、解方程。
8x - 6 = 26
3(x + 1.8) = 15.6
4.3x - 7.99 = 13.51

$x = 4$ $x = 3.4$
$x = 5$