一、口算。
7÷1.4 =
2.2×20 =
7 - 0.81 =
3.3×0.4 =
0.64÷16 =
0.8×0.08 =
6.4 - 0.8 =
0.3×125 =
9.6÷0.06 =
0.9×100 =
4 - 1.32 =
0.63 + 1.7 =
31.5÷7 =
3.7×0.4 =
7÷0.25 =
0.16×6 =
4.8÷0.4 =
0.2 + 0.35 =
0.55÷5 =
10.3 - 3.7 =
0.05×50 =
1.2 - 0.46 =
1.7 + 3.03 =
1.8 - 0.35 =
0.73 + 0.45 =
0.04×0.3 =
4.2÷0.7 =
0.43×0.2 =
1.6 - 0.52 =
0.9 + 1.4 =

5 44 6.19
1.32 0.04 0.064
5.6 37.5 160
90 2.68 2.33
4.5 1.48 28
0.96 12 0.55
0.11 6.6 2.5
0.74 4.73 1.45
1.18 0.012 6
0.086 1.08 2.3

二、解方程。
100x - 2x = 196
13.2x + 9x = 33.3
2.7x - 0.9x = 9

$x = 2$ $x = 1.5$
$x = 5$