一、口算。
0.88÷0.4 =
0.93 + 0.7 =
3÷0.05 =
0.36 + 0.54 =
0.91÷0.7 =
1.48 + 2.52 =
6.8÷3.4 =
2.15 - 0.66 =
15.8×2 =
5 - 0.92 =
0.72÷0.8 =
2.5 - 2.05 =
0.63÷0.009 =
0.5 + 1.57 =
0.85×20 =
760 - 370 =
0.25×300 =
3.6 + 1.06 =
4.2×0.4 =
0.89 + 0.1 =
4×0.32 =
4.8÷6 =
2.4×80 =
3.6÷0.18 =
0.96 - 0.3 =
0.1÷0.02 =
4.8 + 1.25 =
2.36×10 =
0.81 + 0.9 =
3 - 0.26 =

2.2 1.63 60
0.9 1.3 4
2 1.49 31.6
4.08 0.9 0.45
70 2.07 17
390 75 4.66
1.68 0.99 1.28
0.8 192 20
0.66 5 6.05
23.6 1.71 2.74

二、解方程。
4.5 + x = 8.4
1.5x + 18 = 3x
x - 2.6 + 4.5 = 8

$x = 3.9$ $x = 12$
$x = 6.1$