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一、口算。
拍照批改
$\frac {2}{3}÷7=$
$4-\frac {2}{5}=$
$0.75÷0.125=$
$\frac {1}{2}+\frac {2}{3}=$
$\frac {3}{50}÷\frac {7}{30}=$
$49\% ×\frac {5}{7}=$
$\frac {15}{16}÷\frac {15}{16}=$
拍照批改
$\frac {2}{3}÷7=$
$\frac{2}{21}$
$\frac {35}{36}×\frac {3}{14}=$$\frac{5}{24}$
$11-1.125-2.125=$7.75
$4-\frac {2}{5}=$
$3\frac{3}{5}$
$7.2÷8\% =$90
$\frac {5}{8}-(\frac {5}{8}-\frac {5}{9})=$$\frac{5}{9}$
$0.75÷0.125=$
6
$\frac {3}{4}-50\% =$$\frac{1}{4}$
$\frac {1}{5}+\frac {4}{5}÷\frac {4}{5}=$$\frac{6}{5}$
$\frac {1}{2}+\frac {2}{3}=$
$\frac{7}{6}$
$6.4÷80\% =$8
$1-\frac {1}{3}+\frac {2}{3}=$$\frac{4}{3}$
$\frac {3}{50}÷\frac {7}{30}=$
$\frac{9}{35}$
$\frac {4}{3}-\frac {9}{13}=$$\frac{25}{39}$
$4.8×11-4.8=$48
$49\% ×\frac {5}{7}=$
0.35
$0.99÷0.3=$3.3
$0.25×85\% ×4=$0.85
$\frac {15}{16}÷\frac {15}{16}=$
1
$\frac {4}{7}×\frac {5}{6}=$$\frac{10}{21}$
$3÷(\frac {4}{7}÷4)=$21
答案
$\frac{2}{21}$ $\frac{5}{24}$ 7.75 $3\frac{3}{5}$ 90 $\frac{5}{9}$ 6 $\frac{1}{4}$ $\frac{6}{5}$ $\frac{7}{6}$ 8 $\frac{4}{3}$ $\frac{9}{35}$ $\frac{25}{39}$ 48 0.35 3.3 0.85 1 $\frac{10}{21}$ 21
二、计算下面各题。
$\frac {7}{8}×\frac {12}{13}+\frac {7}{3}÷13$ $(156×\frac {4}{13}-26)×\frac {8}{11}$ $[80\% -(60\% -\frac {1}{2})]÷\frac {7}{8}$
$\frac {7}{22}÷\frac {8}{5}+\frac {3}{22}÷\frac {8}{7}$ $44÷[\frac {7}{6}+(\frac {3}{8}-\frac {1}{6})]$ $\frac {8}{21}÷\frac {6}{5}×\frac {1}{4}×\frac {12}{5}$
$\frac {7}{8}×\frac {12}{13}+\frac {7}{3}÷13$ $(156×\frac {4}{13}-26)×\frac {8}{11}$ $[80\% -(60\% -\frac {1}{2})]÷\frac {7}{8}$
$\frac {7}{22}÷\frac {8}{5}+\frac {3}{22}÷\frac {8}{7}$ $44÷[\frac {7}{6}+(\frac {3}{8}-\frac {1}{6})]$ $\frac {8}{21}÷\frac {6}{5}×\frac {1}{4}×\frac {12}{5}$
答案
$\frac{77}{78}$ 16 $\frac{4}{5}$ $\frac{7}{22}$ 32 $\frac{4}{21}$
解析
1. $\frac{7}{8}×\frac{12}{13}+\frac{7}{3}÷13$
$=\frac{7}{8}×\frac{12}{13}+\frac{7}{3}×\frac{1}{13}$
$=\frac{21}{26}+\frac{7}{39}$
$=\frac{63}{78}+\frac{14}{78}$
$=\frac{77}{78}$
2. $(156×\frac{4}{13}-26)×\frac{8}{11}$
$=(48 - 26)×\frac{8}{11}$
$=22×\frac{8}{11}$
$=16$
3. $[80\%-(60\%-\frac{1}{2})]÷\frac{7}{8}$
$=[0.8 - (0.6 - 0.5)]÷\frac{7}{8}$
$=(0.8 - 0.1)×\frac{8}{7}$
$=0.7×\frac{8}{7}$
$=\frac{4}{5}$
4. $\frac{7}{22}÷\frac{8}{5}+\frac{3}{22}÷\frac{8}{7}$
$=\frac{7}{22}×\frac{5}{8}+\frac{3}{22}×\frac{7}{8}$
$=\frac{35}{176}+\frac{21}{176}$
$=\frac{56}{176}$
$=\frac{7}{22}$
5. $44÷[\frac{7}{6}+(\frac{3}{8}-\frac{1}{6})]$
$=44÷[\frac{7}{6}-\frac{1}{6}+\frac{3}{8}]$
$=44÷[1 + \frac{3}{8}]$
$=44÷\frac{11}{8}$
$=44×\frac{8}{11}$
$=32$
6. $\frac{8}{21}÷\frac{6}{5}×\frac{1}{4}×\frac{12}{5}$
$=\frac{8}{21}×\frac{5}{6}×\frac{1}{4}×\frac{12}{5}$
$=\frac{8}{21}×(\frac{5}{6}×\frac{12}{5})×\frac{1}{4}$
$=\frac{8}{21}×2×\frac{1}{4}$
$=\frac{16}{21}×\frac{1}{4}$
$=\frac{4}{21}$
$=\frac{7}{8}×\frac{12}{13}+\frac{7}{3}×\frac{1}{13}$
$=\frac{21}{26}+\frac{7}{39}$
$=\frac{63}{78}+\frac{14}{78}$
$=\frac{77}{78}$
2. $(156×\frac{4}{13}-26)×\frac{8}{11}$
$=(48 - 26)×\frac{8}{11}$
$=22×\frac{8}{11}$
$=16$
3. $[80\%-(60\%-\frac{1}{2})]÷\frac{7}{8}$
$=[0.8 - (0.6 - 0.5)]÷\frac{7}{8}$
$=(0.8 - 0.1)×\frac{8}{7}$
$=0.7×\frac{8}{7}$
$=\frac{4}{5}$
4. $\frac{7}{22}÷\frac{8}{5}+\frac{3}{22}÷\frac{8}{7}$
$=\frac{7}{22}×\frac{5}{8}+\frac{3}{22}×\frac{7}{8}$
$=\frac{35}{176}+\frac{21}{176}$
$=\frac{56}{176}$
$=\frac{7}{22}$
5. $44÷[\frac{7}{6}+(\frac{3}{8}-\frac{1}{6})]$
$=44÷[\frac{7}{6}-\frac{1}{6}+\frac{3}{8}]$
$=44÷[1 + \frac{3}{8}]$
$=44÷\frac{11}{8}$
$=44×\frac{8}{11}$
$=32$
6. $\frac{8}{21}÷\frac{6}{5}×\frac{1}{4}×\frac{12}{5}$
$=\frac{8}{21}×\frac{5}{6}×\frac{1}{4}×\frac{12}{5}$
$=\frac{8}{21}×(\frac{5}{6}×\frac{12}{5})×\frac{1}{4}$
$=\frac{8}{21}×2×\frac{1}{4}$
$=\frac{16}{21}×\frac{1}{4}$
$=\frac{4}{21}$
