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一、口算。
$ \frac{3}{11} × \frac{5}{18} = $
$ 188 - 99 = $
$ 0.3 ÷ 0.01 = $
$ 5.5 × 6 = $
$ 7.56 - 0.56 = $
$ \frac{2}{5} - \frac{1}{4} = $
$ 0.6 + 36\% = $
$ \frac{1}{8} + \frac{1}{9} = $
$ 5.4 ÷ 0.27 = $
$ 100 × 10\% = $
$ 14 ÷ \frac{7}{48} = $
$ \frac{5}{6} + \frac{5}{8} = $
$ \frac{3}{35} × \frac{7}{9} = $
$ \frac{5}{12} ÷ \frac{3}{4} = $
$ 20\% + \frac{1}{7} = $
$ \frac{4}{3} ÷ \frac{11}{12} = $
$ 100 × 0.36 = $
$ 1\% ÷ 10\% = $
$ 0.13 + 0.43 = $
$ \frac{5}{6} ÷ \frac{15}{8} = $
$ \frac{7}{11} - \frac{2}{33} = $
$ \frac{3}{11} × \frac{5}{18} = $
$\frac{5}{66}$
$ 188 - 99 = $
89
$ 0.3 ÷ 0.01 = $
30
$ 5.5 × 6 = $
33
$ 7.56 - 0.56 = $
7
$ \frac{2}{5} - \frac{1}{4} = $
$\frac{3}{20}$
$ 0.6 + 36\% = $
0.96
$ \frac{1}{8} + \frac{1}{9} = $
$\frac{17}{72}$
$ 5.4 ÷ 0.27 = $
20
$ 100 × 10\% = $
10
$ 14 ÷ \frac{7}{48} = $
96
$ \frac{5}{6} + \frac{5}{8} = $
$\frac{35}{24}$
$ \frac{3}{35} × \frac{7}{9} = $
$\frac{1}{15}$
$ \frac{5}{12} ÷ \frac{3}{4} = $
$\frac{5}{9}$
$ 20\% + \frac{1}{7} = $
$\frac{12}{35}$
$ \frac{4}{3} ÷ \frac{11}{12} = $
$\frac{16}{11}$
$ 100 × 0.36 = $
36
$ 1\% ÷ 10\% = $
0.1
$ 0.13 + 0.43 = $
0.56
$ \frac{5}{6} ÷ \frac{15}{8} = $
$\frac{4}{9}$
$ \frac{7}{11} - \frac{2}{33} = $
$\frac{19}{33}$
答案
一、$\frac{5}{66}$ 89 30 33 7 $\frac{3}{20}$ 0.96 $\frac{17}{72}$ 20 10 96 $\frac{35}{24}$ $\frac{1}{15}$ $\frac{5}{9}$ $\frac{12}{35}$ $\frac{16}{11}$ 36 0.1 0.56 $\frac{4}{9}$ $\frac{19}{33}$
二、计算下面各图形的周长和面积。
答案
二、周长：$(16 + 12)× 2 = 56(\mathrm{cm})$
面积：$16× 12 - 8× 6 = 144(\mathrm{cm}^2)$
周长：$5× 2 + 3 + 3.14× 3÷ 2 = 17.71(\mathrm{cm})$
面积：$5× 3 - 3.14× (3÷ 2)^2÷ 2 = 11.4675(\mathrm{cm}^2)$
面积：$16× 12 - 8× 6 = 144(\mathrm{cm}^2)$
周长：$5× 2 + 3 + 3.14× 3÷ 2 = 17.71(\mathrm{cm})$
面积：$5× 3 - 3.14× (3÷ 2)^2÷ 2 = 11.4675(\mathrm{cm}^2)$
