一、口算。
0.8 + 0.52 =
95×0.2 =
132÷3 =
10 - 2.7 =
4.7÷0.47 =
4.4 + 4.06 =
0.7×0.9 =
12 - 9.6 =
240×3 =
91 - 30.1 =
1.4 + 0.78 =
0.72÷0.3 =
6.4÷3.2 =
0.72 - 0.24 =
0.25×100 =
2 - 0.05 =
28×0.5 =
2.1÷0.07 =
490 + 510 =
3 - 0.27 =
2.4×60 =
5.5×0.4 =
700÷14 =
5.3 - 0.13 =
5÷0.25 =
12×60 =
2.8 + 7.5 =
0.6 - 0.06 =
4.5 + 3.25 =
0.84÷4.2 =

1.32 19 44
7.3 10 8.46
0.63 2.4 720
60.9 2.18 2.4
2 0.48 25
1.95 14 30
1000 2.73 144
2.2 50 5.17
20 720 10.3
0.54 7.75 0.2

二、解方程。
4x - 5×0.4 = 4
12x - 8x = 4.8
0.3x + 3.5×3 = 21

$x = 1.5$ $x = 1.2$
$x = 35$