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一、口算。
$35÷ \frac{14}{3}=$
$\frac{1}{2}× \frac{5}{16}=$
$\frac{9}{11}-\frac{3}{22}=$
$0.8× 0.75=$
$\frac{15}{16}÷ \frac{11}{16}=$
$\frac{3}{4}+\frac{5}{24}=$
$7.75-0.25=$
$160× 12.5\%=$
$3.14× 0.4=$
$\frac{2}{3}-\frac{3}{5}=$
$550÷ 0.55=$
$0.27× 400=$
$\frac{7}{15}× \frac{3}{14}=$
$2.42+1.28=$
$14.28÷ 7=$
$\frac{5}{6}-\frac{3}{4}=$
$\frac{4}{11}÷ \frac{6}{11}=$
$3600-2580=$
$50\%-\frac{1}{7}=$
$\frac{1}{8}+\frac{2}{9}=$
$\frac{7}{3}÷ \frac{35}{12}=$
$35÷ \frac{14}{3}=$
$\frac{15}{2}$
$\frac{1}{2}× \frac{5}{16}=$
$\frac{5}{32}$
$\frac{9}{11}-\frac{3}{22}=$
$\frac{15}{22}$
$0.8× 0.75=$
0.6
$\frac{15}{16}÷ \frac{11}{16}=$
$\frac{15}{11}$
$\frac{3}{4}+\frac{5}{24}=$
$\frac{23}{24}$
$7.75-0.25=$
7.5
$160× 12.5\%=$
20
$3.14× 0.4=$
1.256
$\frac{2}{3}-\frac{3}{5}=$
$\frac{1}{15}$
$550÷ 0.55=$
1000
$0.27× 400=$
108
$\frac{7}{15}× \frac{3}{14}=$
$\frac{1}{10}$
$2.42+1.28=$
3.7
$14.28÷ 7=$
2.04
$\frac{5}{6}-\frac{3}{4}=$
$\frac{1}{12}$
$\frac{4}{11}÷ \frac{6}{11}=$
$\frac{2}{3}$
$3600-2580=$
1020
$50\%-\frac{1}{7}=$
$\frac{5}{14}$
$\frac{1}{8}+\frac{2}{9}=$
$\frac{25}{72}$
$\frac{7}{3}÷ \frac{35}{12}=$
$\frac{4}{5}$
答案
一、$\frac{15}{2}$ $\frac{5}{32}$ $\frac{15}{22}$
0.6 $\frac{15}{11}$ $\frac{23}{24}$
7.5 20 1.256
$\frac{1}{15}$ 1000 108
$\frac{1}{10}$ 3.7 2.04
$\frac{1}{12}$ $\frac{2}{3}$ 1020
$\frac{5}{14}$ $\frac{25}{72}$ $\frac{4}{5}$
0.6 $\frac{15}{11}$ $\frac{23}{24}$
7.5 20 1.256
$\frac{1}{15}$ 1000 108
$\frac{1}{10}$ 3.7 2.04
$\frac{1}{12}$ $\frac{2}{3}$ 1020
$\frac{5}{14}$ $\frac{25}{72}$ $\frac{4}{5}$
二、计算下面各图形的周长和面积。
答案
二、周长：$(2 + 2)×2 + 2×2 + 2×3.14×2÷4 = 15.14(cm)$
面积：$(2 + 2)×2 + 2×2 + 3.14×2^{2}÷4 = 15.14(cm^{2})$
周长：$3.14×6 + 8×2 = 34.84(cm)$
面积：$8×6 - 3.14×(6÷2)^{2} = 19.74(cm^{2})$
面积：$(2 + 2)×2 + 2×2 + 3.14×2^{2}÷4 = 15.14(cm^{2})$
周长：$3.14×6 + 8×2 = 34.84(cm)$
面积：$8×6 - 3.14×(6÷2)^{2} = 19.74(cm^{2})$
