1. 直接写出得数。
$\frac{5}{6} × \frac{3}{5} = $______
$\frac{3}{8} ÷ \frac{7}{8} = $______
$\frac{1}{2} - \frac{1}{5} = $______
$\frac{6}{7} ÷ 3 = $______
$\frac{5}{7} × \frac{2}{5} = $______
$24 × \frac{1}{6} = $______
$\frac{3}{5} + \frac{1}{10} = $______
$1 ÷ \frac{3}{5} = $______
$\frac{5}{6} × \frac{3}{5} = $______
$\frac{3}{8} ÷ \frac{7}{8} = $______
$\frac{1}{2} - \frac{1}{5} = $______
$\frac{6}{7} ÷ 3 = $______
$\frac{5}{7} × \frac{2}{5} = $______
$24 × \frac{1}{6} = $______
$\frac{3}{5} + \frac{1}{10} = $______
$1 ÷ \frac{3}{5} = $______
答案
$\frac{1}{2}$
$\frac{3}{7}$
$\frac{3}{10}$
$\frac{2}{7}$
$\frac{2}{7}$
4
$\frac{7}{10}$
$1\frac{2}{3}$
$\frac{3}{7}$
$\frac{3}{10}$
$\frac{2}{7}$
$\frac{2}{7}$
4
$\frac{7}{10}$
$1\frac{2}{3}$
2. 计算下面各题,注意使用简便方法。
$\frac{5}{8} + \frac{7}{11} + \frac{3}{8} + \frac{4}{11} = $______
$4 ÷ \frac{4}{9} - \frac{4}{9} ÷ 4 = $______
$\frac{5}{9} × \frac{1}{6} + \frac{4}{9} ÷ 6 = $______
$\frac{5}{8} + \frac{7}{11} + \frac{3}{8} + \frac{4}{11} = $______
$4 ÷ \frac{4}{9} - \frac{4}{9} ÷ 4 = $______
$\frac{5}{9} × \frac{1}{6} + \frac{4}{9} ÷ 6 = $______
答案
$=(\frac {5}{8}+\frac {3}{8})+(\frac {7}{11}+\frac {4}{11})$
=1+1
=2
$=4 ×\frac {9}{4}-\frac {4}{9} ×\frac {1}{4}$
$=9-\frac {1}{9}$
$=8 \frac {8}{9}$
$=\frac {5}{9} ×\frac {1}{6}+\frac {4}{9} ×\frac {1}{6}$
$=(\frac {5}{9}+\frac {4}{9}) ×\frac {1}{6}$
$=\frac {1}{6}$
=1+1
=2
$=4 ×\frac {9}{4}-\frac {4}{9} ×\frac {1}{4}$
$=9-\frac {1}{9}$
$=8 \frac {8}{9}$
$=\frac {5}{9} ×\frac {1}{6}+\frac {4}{9} ×\frac {1}{6}$
$=(\frac {5}{9}+\frac {4}{9}) ×\frac {1}{6}$
$=\frac {1}{6}$
3. 先化简,再求比值。
$54:45 = $______
$\frac{68}{51} = $______
$0.36:0.9 = $______
$\frac{1}{2}:\frac{1}{16} = $______
$54:45 = $______
$\frac{68}{51} = $______
$0.36:0.9 = $______
$\frac{1}{2}:\frac{1}{16} = $______
答案
$=(54 \div 9)$:$(45 \div 9)$
=6: 5
$=\frac 65$
$=(\frac {1}{2} ×16)$:$(\frac {1}{16} ×16)$
=8: 1
=8
=36:90
=2: 5
$=\frac 25$
$=\frac {68 \div 17}{51 \div 17}$
=4:3
$=\frac {4}{3}$
=6: 5
$=\frac 65$
$=(\frac {1}{2} ×16)$:$(\frac {1}{16} ×16)$
=8: 1
=8
=36:90
=2: 5
$=\frac 25$
$=\frac {68 \div 17}{51 \div 17}$
=4:3
$=\frac {4}{3}$
4. 填空题。
(1)$\frac{4}{5}$时= (______)分 $\frac{3}{10}$升= (______)毫升 320平方分米= (______)平方米
(2)$120\% = \frac{(\quad)}{(\quad)} = (\quad):(\quad)$ $0.54 = (\quad)\% = (\quad):(\quad) = \frac{(\quad)}{(\quad)}$
(3)200克某种饮料中含有40克橙汁、150克水和10克其他配料。这种饮料中橙汁占(______)%,水占(______)%,其他配料占(______)%。
(4)在113%、$\frac{7}{8}$、0.124和0.875这四个数中,最大的数是(______),最小的数是(______),相等的数是(______)和(______)。
(1)$\frac{4}{5}$时= (______)分 $\frac{3}{10}$升= (______)毫升 320平方分米= (______)平方米
(2)$120\% = \frac{(\quad)}{(\quad)} = (\quad):(\quad)$ $0.54 = (\quad)\% = (\quad):(\quad) = \frac{(\quad)}{(\quad)}$
(3)200克某种饮料中含有40克橙汁、150克水和10克其他配料。这种饮料中橙汁占(______)%,水占(______)%,其他配料占(______)%。
(4)在113%、$\frac{7}{8}$、0.124和0.875这四个数中,最大的数是(______),最小的数是(______),相等的数是(______)和(______)。
答案
48
300
3.2
6
27
5
6
5
54
27
50
50
20
75
5
113%
0.124
$\frac 78$
0.875
5
$\frac 15$
300
3.2
6
27
5
6
5
54
27
50
50
20
75
5
113%
0.124
$\frac 78$
0.875
5
$\frac 15$
登录