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一、口算。
$4.23 - 3.34 =$
$640 ÷ 16 =$
$3.14 × 60 =$
$\dfrac{7}{8} ÷ \dfrac{3}{4} =$
$\dfrac{3}{5} × \dfrac{5}{6} =$
$0.25 × 800 =$
$\dfrac{3}{8} × 16 =$
$4.23 - 3.34 =$
0.89
$580 + 420 =$1000
$14.3 ÷ 1.3 =$11
$640 ÷ 16 =$
40
$125 × 8 =$1000
$\dfrac{4}{9} + \dfrac{1}{6} =$$\dfrac{11}{18}$
$3.14 × 60 =$
188.4
$28.26 ÷ 3.14 =$9
$\dfrac{2}{5} - \dfrac{3}{10} =$$\dfrac{1}{10}$
$\dfrac{7}{8} ÷ \dfrac{3}{4} =$
$\dfrac{7}{6}$
$\dfrac{5}{2} - \dfrac{4}{13} =$$\dfrac{57}{26}$
$19 × 2\% =$0.38
$\dfrac{3}{5} × \dfrac{5}{6} =$
$\dfrac{1}{2}$
$\dfrac{5}{8} ÷ 10 =$$\dfrac{1}{16}$
$\dfrac{2}{3} + \dfrac{1}{4} =$$\dfrac{11}{12}$
$0.25 × 800 =$
200
$\dfrac{4}{5} - \dfrac{3}{10} =$$\dfrac{1}{2}$
$20\% × \dfrac{3}{4} =$$\dfrac{3}{20}$
$\dfrac{3}{8} × 16 =$
6
$\dfrac{1}{3} + 40\% =$$\dfrac{11}{15}$
$1 - \dfrac{6}{7} =$$\dfrac{1}{7}$
答案
周二
一、0.89 1000 11
40 1000 $\dfrac{11}{18}$
188.4 9 $\dfrac{1}{10}$
$\dfrac{7}{6}$ $\dfrac{57}{26}$ 0.38
$\dfrac{1}{2}$ $\dfrac{1}{16}$ $\dfrac{11}{12}$
200 $\dfrac{1}{2}$ $\dfrac{3}{20}$
6 $\dfrac{11}{15}$ $\dfrac{1}{7}$
一、0.89 1000 11
40 1000 $\dfrac{11}{18}$
188.4 9 $\dfrac{1}{10}$
$\dfrac{7}{6}$ $\dfrac{57}{26}$ 0.38
$\dfrac{1}{2}$ $\dfrac{1}{16}$ $\dfrac{11}{12}$
200 $\dfrac{1}{2}$ $\dfrac{3}{20}$
6 $\dfrac{11}{15}$ $\dfrac{1}{7}$
二、计算下面各图形的周长和面积。
答案
二、周长：$(5 + 7)×2 = 24(\mathrm{cm})$
面积：$7×4 = 28(\mathrm{cm}^2)$
周长：$3.14×5×2 =$
$31.4(\mathrm{cm})$
面积：$3.14×(5÷2)^2×2 +$
$5×5 = 64.25(\mathrm{cm}^2)$
面积：$7×4 = 28(\mathrm{cm}^2)$
周长：$3.14×5×2 =$
$31.4(\mathrm{cm})$
面积：$3.14×(5÷2)^2×2 +$
$5×5 = 64.25(\mathrm{cm}^2)$
