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$\frac{2}{3}$

$1 {\frac{3} {10}}$

$\frac{3}{2}$

$6\frac{1}{3}$

$\frac{5}{7}$

$\frac{31} {20}$

$\frac{1}{3}$

16

$?=\frac {20}{30}+\frac {24}{30}-\frac {9}{30}?$

$?=\frac {22}{15}-\frac {9}{30}??$

$=\frac {7}{6}?$

$?=\frac {7}{10}+\frac {3}{10}-\frac {3}{7}??$

$=1-\frac {3}{7}??$

$= \frac {4}{7}?$

$?=(\frac {7}{6}+\frac {5}{6})-(\frac {3}{10}+\frac {3}{10})??$

$=2-\frac {3}{5}$

$??=1 \frac {2}{5}?$

$?=(\frac {7}{8}+\frac {1}{8})+(\frac {2}{5}+\frac {3}{5})??$

$=1+1??$

$=2?$

$?=(\frac {11}{8}-\frac {3}{8})-(\frac {5}{6}+\frac {1}{6})??$

$=1-1??$

$=0?$

$?=1-\frac {1}{32}$

$??=\ \frac {31}{32}?$

$ \begin{aligned}解：4.7x&=23.5 \\ x&=5 \\ \end{aligned}$

$ \begin{aligned}解：5x&=1 \\ x&=\frac {1}{5} \\ \end{aligned}$

$ \begin{aligned}解：8x-8&=50 \\ 8x&=58 \\ x&=7.25 \\ \end{aligned}$

$周長:2×2× 3.14÷4×2+(4?2)×4=14.28(\ \mathrm {cm})\ $

$面積:4×4?3.14×2^{2}÷4×2=9.72({c m^{2}})$

$周長:3.14×8÷2+8=20.56(\ \mathrm {cm})\ $

$3.14×(8÷2)+20.56=33.12(\ \mathrm {cm})\ $

$面積:3.14×( 8 ÷2 )^{2}÷2$

$?3.14×(8÷2 ÷2 )^{2}=12.56({c m^{2}})$

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