一、口算。
1.75×8=
0.25×40=
628÷3.14=
8.3+5.7=
1.1×0.8=
1.57÷3.14=
10÷0.1=
0.36÷0.3=
2.512÷3.14=
3.8−1.9=
1.87+5.3=
50.24÷3.14=
7.2÷0.09=
7.5−0.45=
78.5÷3.14=
3.5÷4=
2.4×0.6=
113.04÷3.14=
2.7×0.3=
13.2−1.9=
200.96÷3.14=
26.26÷26=
4.57+6.43=
2.826÷3.14=

14
10
200
14
0.88
0.5
100
1.2
0.8
1.9
7.17
16
80
7.05
25
0.875
1.44
36
0.81
11.3
64
1.01
11
0.9

二、计算下面各题，能用简便算法的就用简便算法。
$\frac{1}{18}×22×9×\frac{3}{11}$
$24×(\frac{5}{12}-\frac{3}{8}+\frac{1}{6})$
$\frac{7}{12}×1.5 - 0.3×\frac{7}{12}$
$\frac{7}{3}-\frac{5}{24}÷\frac{5}{16}$
$(\frac{3}{7}+\frac{5}{8})÷\frac{1}{56}$
$1.2÷\frac{4}{3}+1.2×\frac{1}{4}$

3
5
0.7
$\frac{5}{3}$
59
1.2