登录
一、口算。
$70\% ×300=$
$90\% ×\frac {2}{3}=$
$50\% ×1.05=$
$\frac {5}{9}×37.5\% =$
$4.2×70\% =$
$24\% ×5\% =$
$36\% ×25=$
$\frac {5}{12}×25\% =$
$\frac {4}{5}×50\% =$
$5\% ×18=$
$\frac {3}{8}×25\% =$
$75\% ×\frac {2}{9}=$
$20×45\% =$
$70\% ×5\% =$
$80\% ×\frac {8}{15}=$
$35\% ×\frac {6}{7}=$
$125\% ×\frac {3}{4}=$
$75\% ×2.5=$
$\frac {2}{3}×40\% =$
$50\% ×40\% =$
$44\% ×\frac {10}{33}=$
$70\% ×300=$
210
$90\% ×\frac {2}{3}=$
$\frac{3}{5}$
$50\% ×1.05=$
0.525
$\frac {5}{9}×37.5\% =$
$\frac{5}{24}$
$4.2×70\% =$
2.94
$24\% ×5\% =$
0.012
$36\% ×25=$
9
$\frac {5}{12}×25\% =$
$\frac{5}{48}$
$\frac {4}{5}×50\% =$
$\frac{2}{5}$
$5\% ×18=$
0.9
$\frac {3}{8}×25\% =$
$\frac{3}{32}$
$75\% ×\frac {2}{9}=$
$\frac{1}{6}$
$20×45\% =$
9
$70\% ×5\% =$
0.035
$80\% ×\frac {8}{15}=$
$\frac{32}{75}$
$35\% ×\frac {6}{7}=$
$\frac{3}{10}$
$125\% ×\frac {3}{4}=$
$\frac{15}{16}$
$75\% ×2.5=$
$\frac{15}{8}$
$\frac {2}{3}×40\% =$
$\frac{4}{15}$
$50\% ×40\% =$
0.2
$44\% ×\frac {10}{33}=$
$\frac{2}{15}$
答案
一、210 $\frac{3}{5}$ 0.525 $\frac{5}{24}$ 2.94 0.012 9 $\frac{5}{48}$ $\frac{2}{5}$ 0.9 $\frac{3}{32}$ $\frac{1}{6}$ 9 0.035 $\frac{32}{75}$ $\frac{3}{10}$ $\frac{15}{16}$ $\frac{15}{8}$ $\frac{4}{15}$ 0.2 $\frac{2}{15}$
二、计算下面各题,怎样简便就怎样计算。
$\frac {25}{36}×\frac {9}{11}+\frac {9}{11}×\frac {11}{36}$
$\frac {5}{6}+\frac {1}{6}×\frac {1}{5}+\frac {4}{5}$
$\frac {3}{8}÷(\frac {1}{3}-\frac {8}{21}×\frac {7}{16})$
$(\frac {5}{6}+\frac {7}{8}-\frac {5}{12})÷\frac {1}{24}$
$\frac {1}{3}÷(\frac {7}{4}-\frac {2}{3})×\frac {5}{8}$
$\frac {1}{4}×[(\frac {8}{9}-\frac {2}{3})÷\frac {9}{10}]$
$\frac {25}{36}×\frac {9}{11}+\frac {9}{11}×\frac {11}{36}$
$\frac {5}{6}+\frac {1}{6}×\frac {1}{5}+\frac {4}{5}$
$\frac {3}{8}÷(\frac {1}{3}-\frac {8}{21}×\frac {7}{16})$
$(\frac {5}{6}+\frac {7}{8}-\frac {5}{12})÷\frac {1}{24}$
$\frac {1}{3}÷(\frac {7}{4}-\frac {2}{3})×\frac {5}{8}$
$\frac {1}{4}×[(\frac {8}{9}-\frac {2}{3})÷\frac {9}{10}]$
答案
二、$\frac{9}{11}$ $\frac{5}{3}$ $\frac{9}{4}$ 31 $\frac{5}{26}$ $\frac{5}{81}$
解析
$\frac{25}{36}×\frac{9}{11}+\frac{9}{11}×\frac{11}{36}$
$=\frac{9}{11}×(\frac{25}{36}+\frac{11}{36})$
$=\frac{9}{11}×1$
$=\frac{9}{11}$
$\frac{5}{6}+\frac{1}{6}×\frac{1}{5}+\frac{4}{5}$
$=\frac{5}{6}+\frac{1}{30}+\frac{4}{5}$
$=\frac{25}{30}+\frac{1}{30}+\frac{24}{30}$
$=\frac{50}{30}$
$=\frac{5}{3}$
$\frac{3}{8}÷(\frac{1}{3}-\frac{8}{21}×\frac{7}{16})$
$=\frac{3}{8}÷(\frac{1}{3}-\frac{1}{6})$
$=\frac{3}{8}÷\frac{1}{6}$
$=\frac{3}{8}×6$
$=\frac{9}{4}$
$(\frac{5}{6}+\frac{7}{8}-\frac{5}{12})÷\frac{1}{24}$
$=(\frac{5}{6}+\frac{7}{8}-\frac{5}{12})×24$
$=\frac{5}{6}×24+\frac{7}{8}×24-\frac{5}{12}×24$
$=20 + 21 - 10$
$=31$
$\frac{1}{3}÷(\frac{7}{4}-\frac{2}{3})×\frac{5}{8}$
$=\frac{1}{3}÷(\frac{21}{12}-\frac{8}{12})×\frac{5}{8}$
$=\frac{1}{3}÷\frac{13}{12}×\frac{5}{8}$
$=\frac{1}{3}×\frac{12}{13}×\frac{5}{8}$
$=\frac{4}{13}×\frac{5}{8}$
$=\frac{5}{26}$
$\frac{1}{4}×[(\frac{8}{9}-\frac{2}{3})÷\frac{9}{10}]$
$=\frac{1}{4}×[(\frac{8}{9}-\frac{6}{9})÷\frac{9}{10}]$
$=\frac{1}{4}×[\frac{2}{9}÷\frac{9}{10}]$
$=\frac{1}{4}×[\frac{2}{9}×\frac{10}{9}]$
$=\frac{1}{4}×\frac{20}{81}$
$=\frac{5}{81}$
$=\frac{9}{11}×(\frac{25}{36}+\frac{11}{36})$
$=\frac{9}{11}×1$
$=\frac{9}{11}$
$\frac{5}{6}+\frac{1}{6}×\frac{1}{5}+\frac{4}{5}$
$=\frac{5}{6}+\frac{1}{30}+\frac{4}{5}$
$=\frac{25}{30}+\frac{1}{30}+\frac{24}{30}$
$=\frac{50}{30}$
$=\frac{5}{3}$
$\frac{3}{8}÷(\frac{1}{3}-\frac{8}{21}×\frac{7}{16})$
$=\frac{3}{8}÷(\frac{1}{3}-\frac{1}{6})$
$=\frac{3}{8}÷\frac{1}{6}$
$=\frac{3}{8}×6$
$=\frac{9}{4}$
$(\frac{5}{6}+\frac{7}{8}-\frac{5}{12})÷\frac{1}{24}$
$=(\frac{5}{6}+\frac{7}{8}-\frac{5}{12})×24$
$=\frac{5}{6}×24+\frac{7}{8}×24-\frac{5}{12}×24$
$=20 + 21 - 10$
$=31$
$\frac{1}{3}÷(\frac{7}{4}-\frac{2}{3})×\frac{5}{8}$
$=\frac{1}{3}÷(\frac{21}{12}-\frac{8}{12})×\frac{5}{8}$
$=\frac{1}{3}÷\frac{13}{12}×\frac{5}{8}$
$=\frac{1}{3}×\frac{12}{13}×\frac{5}{8}$
$=\frac{4}{13}×\frac{5}{8}$
$=\frac{5}{26}$
$\frac{1}{4}×[(\frac{8}{9}-\frac{2}{3})÷\frac{9}{10}]$
$=\frac{1}{4}×[(\frac{8}{9}-\frac{6}{9})÷\frac{9}{10}]$
$=\frac{1}{4}×[\frac{2}{9}÷\frac{9}{10}]$
$=\frac{1}{4}×[\frac{2}{9}×\frac{10}{9}]$
$=\frac{1}{4}×\frac{20}{81}$
$=\frac{5}{81}$
