1. 直接写出得数。(4分)
$\frac {1}{3}-\frac {1}{5}= $ $\frac {3}{4}÷12= $ $36÷\frac {4}{9}= $ $\frac {8}{9}×\frac {3}{10}÷\frac {1}{3}= $
$\frac {3}{4}+\frac {5}{8}= $ $\frac {4}{9}×12= $ $\frac {3}{2}÷\frac {3}{8}= $ $21×\frac {3}{14}×\frac {3}{4}= $
$\frac {1}{3}-\frac {1}{5}= $ $\frac {3}{4}÷12= $ $36÷\frac {4}{9}= $ $\frac {8}{9}×\frac {3}{10}÷\frac {1}{3}= $
$\frac {3}{4}+\frac {5}{8}= $ $\frac {4}{9}×12= $ $\frac {3}{2}÷\frac {3}{8}= $ $21×\frac {3}{14}×\frac {3}{4}= $
答案:
$\frac{2}{15}$ $\frac{1}{16}$ 81 $\frac{4}{5}$ $\frac{11}{8}$ $\frac{16}{3}$ 4 $\frac{27}{8}$
2. 计算下面各题。(12分)
$45×\frac {4}{5}×\frac {2}{9}$ $\frac {10}{21}÷\frac {5}{6}×\frac {2}{3}$ $\frac {2}{3}×\frac {1}{10}÷\frac {8}{15}$
$24×\frac {3}{8}÷\frac {15}{4}$ $\frac {15}{16}÷\frac {5}{6}÷\frac {3}{8}$ $\frac {16}{9}÷\frac {8}{11}×\frac {3}{22}$
$45×\frac {4}{5}×\frac {2}{9}$ $\frac {10}{21}÷\frac {5}{6}×\frac {2}{3}$ $\frac {2}{3}×\frac {1}{10}÷\frac {8}{15}$
$24×\frac {3}{8}÷\frac {15}{4}$ $\frac {15}{16}÷\frac {5}{6}÷\frac {3}{8}$ $\frac {16}{9}÷\frac {8}{11}×\frac {3}{22}$
答案:
8 $\frac{8}{21}$ $\frac{1}{8}$ $\frac{12}{5}$ 3 $\frac{1}{3}$
3. 解方程。(6分)
$\frac {2}{3}x= \frac {4}{5}$ $\frac {6}{5}x÷\frac {1}{2}= 6$ $\frac {2}{3}x-\frac {1}{4}x= \frac {5}{18}$
$\frac {2}{3}x= \frac {4}{5}$ $\frac {6}{5}x÷\frac {1}{2}= 6$ $\frac {2}{3}x-\frac {1}{4}x= \frac {5}{18}$
答案:
$x=\frac{6}{5}$ $x=\frac{5}{2}$ $x=\frac{2}{3}$
1. $8:$( )$=4:5= \frac {( )}{20}= \frac {20}{( )}$
答案:
10 16 25
2. $\frac {7}{12}$时= ( )分 $\frac {3}{50}$公顷= ( )平方米
5.4立方分米= ( )立方厘米 7立方米20立方分米= ( )立方米
5.4立方分米= ( )立方厘米 7立方米20立方分米= ( )立方米
答案:
35 600 5400 7.02
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