一、口算。
11.5÷5%= $\frac{5}{8}-\frac{5}{9}=$ $\frac{1}{2}+\frac{1}{3}+\frac{1}{6}=$
$\frac{3}{5}+\frac{12}{5}=$ 4.5×0.4= $(\frac{4}{7}+\frac{4}{7})\div\frac{4}{7}=$
65.5÷0.5= 6.75 - 0.07= $\frac{1}{4}\times\frac{8}{5}\times8=$
$\frac{7}{8}-\frac{5}{6}=$ $\frac{3}{26}\times\frac{13}{18}=$ 5.5+(8.2 - 4.5)=
0×$\frac{5}{11}=$ $\frac{4}{5}\div\frac{16}{15}=$ 24÷$(\frac{8}{5}\times\frac{1}{3})=$
6.8÷0.4= $\frac{1}{5}+\frac{3}{8}=$ (2.7 + 5.3)×0.5=
275÷2.5= 1.05×0.8= 2.9×0.25×4=
$\frac{7}{8}\times\frac{20}{21}=$ 7.3 + 13.7= 3.6÷8÷0.25=
4.8÷80= $\frac{9}{40}\div\frac{3}{20}=$ 2.8 - (0.75 - 0.25)=
1 - 0.72= 0.3 + $\frac{9}{10}=$ 15×$\frac{9}{10}\div60\%=$

230 $\frac{5}{72}$ 1
3 1.8 2
131 6.68 $\frac{16}{5}$
$\frac{1}{24}$ $\frac{1}{12}$ 9.2
0 $\frac{3}{4}$ 45
17 $\frac{23}{40}$ 4
110 0.84 2.9
$\frac{5}{6}$ 21 1.8
0.06 $\frac{3}{2}$ 2.3
0.28 1.2 $\frac{45}{2}$

二、填一填。

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