一、口算。
0.56÷8 =
5.5 - 0.11 =
45÷0.5÷9 =
0.09×800 =
7.5÷0.5 =
930÷(5×0.6) =
10÷2.5 =
0.06×90 =
0.25×8.5×4 =
0.7 + 0.77 =
3.6÷0.6 =
23 - 3.8 - 16.2 =
64÷0.8 =
2.7 + 0.23 =
0.2×(0.2 + 0.2) =
1 - 0.92 =
0.55×0.2 =
2.5×(4÷0.5) =
3.2×0.5 =
0.8÷0.02 =
1.5 - 1.5×0.3 =
9.8÷49 =
0.14×50 =
3.5×9 + 3.5 =
3.9 + 4.41 =
7.25 - 2.75 =
17.3 - (3.7 + 7.3) =
1.2×50 =
6÷1.2 =
2.6 - 2.1 + 7.4 =

0.07 5.39 10
72 15 310
4 5.4 8.5
1.47 6 3
80 2.93 0.08
0.08 0.11 20
1.6 40 1.05
0.2 7 35
8.31 4.5 6.3
60 5 7.9

二、解方程。
7x + 6.3 = 8.4
3.6x - 1.8x = 14.4
4(x + 0.13) = 24

$x = 0.3$ $x = 8$
$x = 5.87$