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一、口算。
$25\% ÷\frac {3}{5}=$
$68\% ÷0.17=$
$30\% +\frac {2}{5}=$
$2×35\% =$
$\frac {5}{9}×54\% =$
$\frac {15}{16}×10\% =$
$8.2÷200\% =$
$40\% ×2.5=$
$4.5÷50\% =$
$113\% -53\% =$
$25\% -\frac {1}{5}=$
$35\% ×0.3=$
$220\% ×0.5=$
$\frac {7}{10}×62.5\% =$
$30\% ×\frac {10}{7}=$
$72\% +2.7=$
$2.5\% ×60=$
$50\% ×\frac {8}{5}=$
$63.3\% ÷0.3=$
$71\% -27\% =$
$300×16\% =$
$25\% ÷\frac {3}{5}=$
$\frac{5}{12}$
$68\% ÷0.17=$
4
$30\% +\frac {2}{5}=$
0.7
$2×35\% =$
0.7
$\frac {5}{9}×54\% =$
0.3
$\frac {15}{16}×10\% =$
$\frac{3}{32}$
$8.2÷200\% =$
4.1
$40\% ×2.5=$
1
$4.5÷50\% =$
9
$113\% -53\% =$
0.6
$25\% -\frac {1}{5}=$
$\frac{1}{20}$
$35\% ×0.3=$
0.105
$220\% ×0.5=$
1.1
$\frac {7}{10}×62.5\% =$
$\frac{7}{16}$
$30\% ×\frac {10}{7}=$
$\frac{3}{7}$
$72\% +2.7=$
3.42
$2.5\% ×60=$
1.5
$50\% ×\frac {8}{5}=$
$\frac{4}{5}$
$63.3\% ÷0.3=$
2.11
$71\% -27\% =$
0.44
$300×16\% =$
48
答案
一、$\frac{5}{12}$ 4 0.7 0.7 0.3 $\frac{3}{32}$ 4.1 1 9 0.6 $\frac{1}{20}$ 0.105 1.1 $\frac{7}{16}$ $\frac{3}{7}$ 3.42 1.5 $\frac{4}{5}$ 2.11 0.44 48
解析
$25\% ÷\frac {3}{5}=\frac{1}{4}×\frac{5}{3}=\frac{5}{12}$
$68\% ÷0.17=0.68÷0.17=4$
$30\% +\frac {2}{5}=0.3 + 0.4=0.7$
$2×35\% =2×0.35=0.7$
$\frac {5}{9}×54\%=\frac{5}{9}×0.54=0.3$
$\frac {15}{16}×10\%=\frac{15}{16}×\frac{1}{10}=\frac{3}{32}$
$8.2÷200\%=8.2÷2=4.1$
$40\% ×2.5=0.4×2.5=1$
$4.5÷50\%=4.5÷0.5=9$
$113\% -53\%=0.6$
$25\% -\frac {1}{5}=0.25 - 0.2=0.05=\frac{1}{20}$
$35\% ×0.3=0.35×0.3=0.105$
$220\% ×0.5=2.2×0.5=1.1$
$\frac {7}{10}×62.5\%=\frac{7}{10}×\frac{5}{8}=\frac{7}{16}$
$30\% ×\frac {10}{7}=\frac{3}{10}×\frac{10}{7}=\frac{3}{7}$
$72\% +2.7=0.72 + 2.7=3.42$
$2.5\% ×60=0.025×60=1.5$
$50\% ×\frac {8}{5}=\frac{1}{2}×\frac{8}{5}=\frac{4}{5}$
$63.3\% ÷0.3=0.633÷0.3=2.11$
$71\% -27\%=0.44$
$300×16\%=300×0.16=48$
$68\% ÷0.17=0.68÷0.17=4$
$30\% +\frac {2}{5}=0.3 + 0.4=0.7$
$2×35\% =2×0.35=0.7$
$\frac {5}{9}×54\%=\frac{5}{9}×0.54=0.3$
$\frac {15}{16}×10\%=\frac{15}{16}×\frac{1}{10}=\frac{3}{32}$
$8.2÷200\%=8.2÷2=4.1$
$40\% ×2.5=0.4×2.5=1$
$4.5÷50\%=4.5÷0.5=9$
$113\% -53\%=0.6$
$25\% -\frac {1}{5}=0.25 - 0.2=0.05=\frac{1}{20}$
$35\% ×0.3=0.35×0.3=0.105$
$220\% ×0.5=2.2×0.5=1.1$
$\frac {7}{10}×62.5\%=\frac{7}{10}×\frac{5}{8}=\frac{7}{16}$
$30\% ×\frac {10}{7}=\frac{3}{10}×\frac{10}{7}=\frac{3}{7}$
$72\% +2.7=0.72 + 2.7=3.42$
$2.5\% ×60=0.025×60=1.5$
$50\% ×\frac {8}{5}=\frac{1}{2}×\frac{8}{5}=\frac{4}{5}$
$63.3\% ÷0.3=0.633÷0.3=2.11$
$71\% -27\%=0.44$
$300×16\%=300×0.16=48$
二、计算下面各题。
$\frac {3}{4}×38+2×75\% $
$(40+\frac {5}{9})×90\% $
$1.6÷8+22.4×12.5\% $
$60\% ×\frac {1}{6}-50\% ÷5$
$70\% ×\frac {6}{7}÷80\% ×\frac {3}{8}$
$\frac {3}{14}×(75\% -10\% ×\frac {1}{2})$
$\frac {3}{4}×38+2×75\% $
$(40+\frac {5}{9})×90\% $
$1.6÷8+22.4×12.5\% $
$60\% ×\frac {1}{6}-50\% ÷5$
$70\% ×\frac {6}{7}÷80\% ×\frac {3}{8}$
$\frac {3}{14}×(75\% -10\% ×\frac {1}{2})$
答案
二、30 $36\frac{1}{2}$ 3 0 $\frac{9}{32}$ $\frac{3}{20}$
解析
$\frac{3}{4}×38 + 2×75\%$
$=\frac{3}{4}×38 + 2×\frac{3}{4}$
$=\frac{3}{4}×(38 + 2)$
$=\frac{3}{4}×40$
$=30$
$(40 + \frac{5}{9})×90\%$
$=(40 + \frac{5}{9})×\frac{9}{10}$
$=40×\frac{9}{10} + \frac{5}{9}×\frac{9}{10}$
$=36 + \frac{1}{2}$
$=36\frac{1}{2}$
$1.6÷8 + 22.4×12.5\%$
$=1.6×\frac{1}{8} + 22.4×\frac{1}{8}$
$=(1.6 + 22.4)×\frac{1}{8}$
$=24×\frac{1}{8}$
$=3$
$60\%×\frac{1}{6} - 50\%÷5$
$=\frac{3}{5}×\frac{1}{6} - \frac{1}{2}×\frac{1}{5}$
$=\frac{1}{10} - \frac{1}{10}$
$=0$
$70\%×\frac{6}{7}÷80\%×\frac{3}{8}$
$=\frac{7}{10}×\frac{6}{7}÷\frac{4}{5}×\frac{3}{8}$
$=\frac{3}{5}×\frac{5}{4}×\frac{3}{8}$
$=\frac{3}{4}×\frac{3}{8}$
$=\frac{9}{32}$
$\frac{3}{14}×(75\% - 10\%×\frac{1}{2})$
$=\frac{3}{14}×(\frac{3}{4} - \frac{1}{10}×\frac{1}{2})$
$=\frac{3}{14}×(\frac{3}{4} - \frac{1}{20})$
$=\frac{3}{14}×(\frac{15}{20} - \frac{1}{20})$
$=\frac{3}{14}×\frac{14}{20}$
$=\frac{3}{20}$
$=\frac{3}{4}×38 + 2×\frac{3}{4}$
$=\frac{3}{4}×(38 + 2)$
$=\frac{3}{4}×40$
$=30$
$(40 + \frac{5}{9})×90\%$
$=(40 + \frac{5}{9})×\frac{9}{10}$
$=40×\frac{9}{10} + \frac{5}{9}×\frac{9}{10}$
$=36 + \frac{1}{2}$
$=36\frac{1}{2}$
$1.6÷8 + 22.4×12.5\%$
$=1.6×\frac{1}{8} + 22.4×\frac{1}{8}$
$=(1.6 + 22.4)×\frac{1}{8}$
$=24×\frac{1}{8}$
$=3$
$60\%×\frac{1}{6} - 50\%÷5$
$=\frac{3}{5}×\frac{1}{6} - \frac{1}{2}×\frac{1}{5}$
$=\frac{1}{10} - \frac{1}{10}$
$=0$
$70\%×\frac{6}{7}÷80\%×\frac{3}{8}$
$=\frac{7}{10}×\frac{6}{7}÷\frac{4}{5}×\frac{3}{8}$
$=\frac{3}{5}×\frac{5}{4}×\frac{3}{8}$
$=\frac{3}{4}×\frac{3}{8}$
$=\frac{9}{32}$
$\frac{3}{14}×(75\% - 10\%×\frac{1}{2})$
$=\frac{3}{14}×(\frac{3}{4} - \frac{1}{10}×\frac{1}{2})$
$=\frac{3}{14}×(\frac{3}{4} - \frac{1}{20})$
$=\frac{3}{14}×(\frac{15}{20} - \frac{1}{20})$
$=\frac{3}{14}×\frac{14}{20}$
$=\frac{3}{20}$
