1. 直接写出得数。
0.3÷0.15=
5.4×2=
0.5−0.15=
(1.2+8.8)×0.4=
0.08+1.2=
4.8−0.62=
1.4×30=
1.6+0.43+4.4=
9.8÷20=
1.5×0.4=
2−1.6=
6.8−(2.3+0.25)=
0.75×80=
0.5÷0.01=
4.5+0.36=
1.6+0.6×5=
7.3−3.4=
5.4−3.6=
0.54÷9=
(0.15+2.1)÷5=
5.4−0.5=
1.75+2.35=
4.08×5=
1.25×7×8=
8×$\frac{3}{10}$=
$\frac{3}{8}$÷2=
$\frac{3}{2}$×$\frac{4}{39}$=
1−$\frac{2}{5}$+$\frac{3}{5}$=
$\frac{5}{6}$×3.6=
$\frac{7}{5}$×$\frac{7}{5}$=
$\frac{9}{10}$÷$\frac{1}{5}$=
$\frac{4}{7}$÷7÷$\frac{4}{7}$=

0.3÷0.15=2
5.4×2=10.8
0.5−0.15=0.35
(1.2+8.8)×0.4=4
0.08+1.2=1.28
4.8−0.62=4.18
1.4×30=42
1.6+0.43+4.4=6.43
9.8÷20=0.49
1.5×0.4=0.6
2−1.6=0.4
6.8−(2.3+0.25)=4.25
0.75×80=60
0.5÷0.01=50
4.5+0.36=4.86
1.6+0.6×5=4.6
7.3−3.4=3.9
5.4−3.6=1.8
0.54÷9=0.06
(0.15+2.1)÷5=0.45
5.4−0.5=4.9
1.75+2.35=4.1
4.08×5=20.4
1.25×7×8=70
8×$\frac{3}{10}$=$\frac{12}{5}$
$\frac{3}{8}$÷2=$\frac{3}{16}$
$\frac{3}{2}$×$\frac{4}{39}$=$\frac{2}{13}$
1−$\frac{2}{5}$+$\frac{3}{5}$=$\frac{6}{5}$
$\frac{5}{6}$×3.6=3
$\frac{7}{5}$×$\frac{7}{5}$=$\frac{49}{25}$
$\frac{9}{10}$÷$\frac{1}{5}$=4.5
$\frac{4}{7}$÷7÷$\frac{4}{7}$=$\frac{1}{7}$

2. 计算下面各题，怎样算简便就怎样算。
$\frac{6}{7}×(\frac{7}{6}+28)$
$(\frac{5}{6}-\frac{3}{4})÷(\frac{1}{4}+\frac{1}{8})$
$[\frac{5}{6}-(\frac{1}{2}-\frac{1}{3})]÷\frac{4}{9}$
$2.73×0.99$
$4×(10.5-8.3)+3.9$
$6.87×[40÷(3.82-3.42)]$

$\frac{6}{7}×(\frac{7}{6}+28)=25$
$(\frac{5}{6}-\frac{3}{4})÷(\frac{1}{4}+\frac{1}{8})=\frac{2}{9}$
$[\frac{5}{6}-(\frac{1}{2}-\frac{1}{3})]÷\frac{4}{9}=\frac{3}{2}$
$2.73×0.99=2.7027$
$4×(10.5-8.3)+3.9=12.7$
$6.87×[40÷(3.82-3.42)]=687$

对于任意两个数m和n，定义新运算：$m * n = 3m - 1.2n$，试计算下面各题。
$4.5 * 0.1$
$5.93 * 2.2 * 0.17$

$4.5 * 0.1=3×4.5−1.2×0.1=13.38$
$5.93 * 2.2 * 0.17=(3×5.93−1.2×2.2)×0.17$
$=(17.79−2.64)×0.17$
$=15.15×0.17$
$=3×15.15−1.2×0.17$
$=45.45−0.204$
$=45.246$