2025年通城学典计算能手六年级数学上册苏教版江苏专版第113页答案
一、简便计算下面各题。
$75×\frac {75}{76}-\frac {1}{76}$ $\frac {9}{7}×\frac {9}{7}+\frac {5}{7}×\frac {9}{7}-\frac {9}{7}$ $\frac {7}{8}-\frac {5}{12}+\frac {1}{8}-\frac {1}{12}$
$(8+\frac {4}{5})×\frac {5}{8}+\frac {1}{2}$ $\frac {13}{49}×22+13×\frac {27}{49}$ $\frac {7}{8}×\frac {16}{15}+\frac {4}{7}+\frac {3}{7}$
$\frac {1}{2}÷\frac {1}{3}÷\frac {3}{5}÷\frac {5}{7}$ $3-\frac {5}{18}×\frac {27}{40}-\frac {13}{16}$ $37.5\% ×\frac {5}{9}+\frac {4}{9}×\frac {3}{8}$
$(\frac {3}{4}+\frac {5}{6}-\frac {7}{12})×36$ $25\% +\frac {2}{7}×\frac {1}{4}+\frac {5}{7}÷4$ $\frac {11}{12}÷7+\frac {6}{7}÷\frac {12}{11}$

答案

1. **计算$75×\frac {75}{76}-\frac {1}{76}$:
解:
$75×\frac {75}{76}-\frac {1}{76}=(76 - 1)×\frac {75}{76}-\frac {1}{76}$
$=76×\frac {75}{76}-1×\frac {75}{76}-\frac {1}{76}$
$=75-(\frac {75}{76}+\frac {1}{76})$
$=75 - 1$
$=74$
2. **计算$\frac {9}{7}×\frac {9}{7}+\frac {5}{7}×\frac {9}{7}-\frac {9}{7}$:
解:
$\frac {9}{7}×\frac {9}{7}+\frac {5}{7}×\frac {9}{7}-\frac {9}{7}=\frac {9}{7}×(\frac {9}{7}+\frac {5}{7}-1)$
$=\frac {9}{7}×(\frac {14}{7}-1)$
$=\frac {9}{7}×1$
$=\frac {9}{7}$
3. **计算$\frac {7}{8}-\frac {5}{12}+\frac {1}{8}-\frac {1}{12}$:
解:
$(\frac {7}{8}+\frac {1}{8})-(\frac {5}{12}+\frac {1}{12})$
$=1-\frac {1}{2}$
$=\frac {1}{2}$
4. **计算$(8+\frac {4}{5})×\frac {5}{8}+\frac {1}{2}$:
解:
$8×\frac {5}{8}+\frac {4}{5}×\frac {5}{8}+\frac {1}{2}$
$=5+\frac {1}{2}+\frac {1}{2}$
$=5 + 1$
$=6$
5. **计算$\frac {13}{49}×22+13×\frac {27}{49}$:
解:
$\frac {13}{49}×22+\frac {13}{49}×27$
$=\frac {13}{49}×(22 + 27)$
$=\frac {13}{49}×49$
$=13$
6. **计算$\frac {7}{8}×\frac {16}{15}+\frac {4}{7}+\frac {3}{7}$:
解:
$\frac {14}{15}+(\frac {4}{7}+\frac {3}{7})$
$=\frac {14}{15}+1$
$=1\frac {14}{15}$
7. **计算$\frac {1}{2}÷\frac {1}{3}÷\frac {3}{5}÷\frac {5}{7}$:
解:
$\frac {1}{2}×3×\frac {5}{3}×\frac {7}{5}$
$=\frac {1}{2}×7$
$=\frac {7}{2}$
8. **计算$3-\frac {5}{18}×\frac {27}{40}-\frac {13}{16}$:
解:
$3-\frac {3}{16}-\frac {13}{16}$
$=3-(\frac {3}{16}+\frac {13}{16})$
$=3 - 1$
$=2$
9. **计算$37.5\% ×\frac {5}{9}+\frac {4}{9}×\frac {3}{8}$:
解:
$\frac {3}{8}×\frac {5}{9}+\frac {4}{9}×\frac {3}{8}$
$=\frac {3}{8}×(\frac {5}{9}+\frac {4}{9})$
$=\frac {3}{8}×1$
$=\frac {3}{8}$
10. **计算$(\frac {3}{4}+\frac {5}{6}-\frac {7}{12})×36$:
解:
$\frac {3}{4}×36+\frac {5}{6}×36-\frac {7}{12}×36$
$=27 + 30-21$
$=36$
11. **计算$25\%+\frac {2}{7}×\frac {1}{4}+\frac {5}{7}÷4$:
解:
$\frac {1}{4}+\frac {2}{7}×\frac {1}{4}+\frac {5}{7}×\frac {1}{4}$
$=\frac {1}{4}×(1+\frac {2}{7}+\frac {5}{7})$
$=\frac {1}{4}×2$
$=\frac {1}{2}$
12. **计算$\frac {11}{12}÷7+\frac {6}{7}÷\frac {12}{11}$:
解:
$\frac {11}{12}×\frac {1}{7}+\frac {6}{7}×\frac {11}{12}$
$\frac {11}{12}×(\frac {1}{7}+\frac {6}{7})$
$\frac {11}{12}×1$
$=\frac {11}{12}$
综上,答案依次为$74$;$\frac {9}{7}$;$\frac {1}{2}$;$6$;$13$;$1\frac {14}{15}$;$\frac {7}{2}$;$2$;$\frac {3}{8}$;$36$;$\frac {1}{2}$;$\frac {11}{12}$。
二、计算下面各题,怎样简便就怎样计算。
$\frac {1}{2}+\frac {9}{20}÷\frac {9}{10}-\frac {5}{8}$ $(\frac {9}{10}+\frac {3}{5})×(\frac {2}{9}-\frac {2}{15})$ $180÷(1+25\% )+180$
$(1-\frac {2}{3}×\frac {3}{5})×\frac {5}{6}$ $\frac {7}{8}÷\frac {3}{8}-\frac {1}{8}÷\frac {3}{8}$ $18×(\frac {1}{2}×\frac {1}{3}×\frac {1}{6})$
$8÷\frac {4}{9}+\frac {1}{9}×6$ $(\frac {2}{3}+\frac {7}{9}×\frac {9}{28})÷\frac {11}{12}$ $7÷(\frac {3}{5}-25\% )×\frac {4}{5}$
$\frac {1}{8}×\frac {5}{9}+\frac {4}{9}÷8$ $\frac {5}{6}-(\frac {1}{2}-\frac {1}{3})×\frac {9}{10}$ $16÷\frac {2}{3}×\frac {3}{4}+\frac {5}{7}$
$\frac {1}{8}×151+\frac {1}{8}×42+\frac {1}{8}$ $(1-\frac {8}{15}×\frac {1}{2})÷\frac {4}{5}$ $(\frac {1}{8}+\frac {3}{4})×(1-\frac {1}{3})$
$\frac {9}{5}÷(\frac {3}{5}-\frac {1}{25}×\frac {3}{2})$ $\frac {14}{25}÷[\frac {1}{3}×(\frac {4}{5}+\frac {1}{4})]$ $1300-1300×80\% ×95\%$

答案

1. 计算$\frac{1}{2}+\frac{9}{20}÷\frac{9}{10}-\frac{5}{8}$:
解:
先算除法$\frac{9}{20}÷\frac{9}{10}=\frac{9}{20}×\frac{10}{9}=\frac{1}{2}$;
再算$\frac{1}{2}+\frac{1}{2}-\frac{5}{8}=1 - \frac{5}{8}=\frac{3}{8}$。
2. 计算$(\frac{9}{10}+\frac{3}{5})×(\frac{2}{9}-\frac{2}{15})$:
解:
先算括号内$\frac{9}{10}+\frac{3}{5}=\frac{9 + 6}{10}=\frac{3}{2}$,$\frac{2}{9}-\frac{2}{15}=\frac{10 - 6}{45}=\frac{4}{45}$;
再算乘法$\frac{3}{2}×\frac{4}{45}=\frac{2}{15}$。
3. 计算$180÷(1 + 25\%)+180$:
解:
先算括号内$1 + 25\%=\frac{5}{4}$,$180÷\frac{5}{4}=180×\frac{4}{5}=144$;
再算$144+180 = 324$。
4. 计算$(1-\frac{2}{3}×\frac{3}{5})×\frac{5}{6}$:
解:
先算括号内$\frac{2}{3}×\frac{3}{5}=\frac{2}{5}$,$1-\frac{2}{5}=\frac{3}{5}$;
再算$\frac{3}{5}×\frac{5}{6}=\frac{1}{2}$。
5. 计算$\frac{7}{8}÷\frac{3}{8}-\frac{1}{8}÷\frac{3}{8}$:
解:
根据除法分配律$(\frac{7}{8}-\frac{1}{8})÷\frac{3}{8}=\frac{6}{8}×\frac{8}{3}=2$。
6. 计算$18×(\frac{1}{2}×\frac{1}{3}×\frac{1}{6})$:
解:
先算括号内$\frac{1}{2}×\frac{1}{3}×\frac{1}{6}=\frac{1}{36}$;
再算$18×\frac{1}{36}=\frac{1}{2}$。
7. 计算$8÷\frac{4}{9}+\frac{1}{9}×6$:
解:
先算除法$8÷\frac{4}{9}=8×\frac{9}{4}=18$,乘法$\frac{1}{9}×6=\frac{2}{3}$;
再算$18+\frac{2}{3}=18\frac{2}{3}$。
8. 计算$(\frac{2}{3}+\frac{7}{9}×\frac{9}{28})÷\frac{11}{12}$:
解:
先算括号内$\frac{7}{9}×\frac{9}{28}=\frac{1}{4}$,$\frac{2}{3}+\frac{1}{4}=\frac{8 + 3}{12}=\frac{11}{12}$;
再算$\frac{11}{12}÷\frac{11}{12}=1$。
9. 计算$7÷(\frac{3}{5}-25\%)×\frac{4}{5}$:
解:
先算括号内$\frac{3}{5}-25\%=\frac{3}{5}-\frac{1}{4}=\frac{12 - 5}{20}=\frac{7}{20}$;
$7÷\frac{7}{20}=7×\frac{20}{7}=20$;
再算$20×\frac{4}{5}=16$。
10. 计算$\frac{1}{8}×\frac{5}{9}+\frac{4}{9}÷8$:
解:
把除法变乘法$\frac{1}{8}×\frac{5}{9}+\frac{4}{9}×\frac{1}{8}=\frac{1}{8}×(\frac{5}{9}+\frac{4}{9})=\frac{1}{8}$。
11. 计算$\frac{5}{6}-(\frac{1}{2}-\frac{1}{3})×\frac{9}{10}$:
解:
先算括号内$\frac{1}{2}-\frac{1}{3}=\frac{1}{6}$;
再算$\frac{1}{6}×\frac{9}{10}=\frac{3}{20}$;
最后算$\frac{5}{6}-\frac{3}{20}=\frac{50 - 9}{60}=\frac{41}{60}$。
12. 计算$16÷\frac{2}{3}×\frac{3}{4}+\frac{5}{7}$:
解:
先算除法$16÷\frac{2}{3}=16×\frac{3}{2}=24$;
再算乘法$24×\frac{3}{4}=18$;
最后算$18+\frac{5}{7}=18\frac{5}{7}$。
13. 计算$\frac{1}{8}×151+\frac{1}{8}×42+\frac{1}{8}$:
解:
根据乘法分配律$\frac{1}{8}×(151 + 42+1)=\frac{1}{8}×194=\frac{97}{4}$。
14. 计算$(1-\frac{8}{15}×\frac{1}{2})÷\frac{4}{5}$:
解:
先算括号内$\frac{8}{15}×\frac{1}{2}=\frac{4}{15}$,$1-\frac{4}{15}=\frac{11}{15}$;
再算$\frac{11}{15}÷\frac{4}{5}=\frac{11}{15}×\frac{5}{4}=\frac{11}{12}$。
15. 计算$(\frac{1}{8}+\frac{3}{4})×(1-\frac{1}{3})$:
解:
先算括号内$\frac{1}{8}+\frac{3}{4}=\frac{1 + 6}{8}=\frac{7}{8}$,$1-\frac{1}{3}=\frac{2}{3}$;
再算$\frac{7}{8}×\frac{2}{3}=\frac{7}{12}$。
16. 计算$\frac{9}{5}÷(\frac{3}{5}-\frac{1}{25}×\frac{3}{2})$:
解:
先算括号内$\frac{1}{25}×\frac{3}{2}=\frac{3}{50}$,$\frac{3}{5}-\frac{3}{50}=\frac{30 - 3}{50}=\frac{27}{50}$;
再算$\frac{9}{5}÷\frac{27}{50}=\frac{9}{5}×\frac{50}{27}=\frac{10}{3}$。
17. 计算$\frac{14}{25}÷[\frac{1}{3}×(\frac{4}{5}+\frac{1}{4})]$:
解:
先算小括号内$\frac{4}{5}+\frac{1}{4}=\frac{16 + 5}{20}=\frac{21}{20}$;
再算中括号内$\frac{1}{3}×\frac{21}{20}=\frac{7}{20}$;
最后算$\frac{14}{25}÷\frac{7}{20}=\frac{14}{25}×\frac{20}{7}=\frac{8}{5}$。
18. 计算$1300-1300×80\%×95\%$:
解:
先算乘法$1300×80\%×95\%=1300×0.8×0.95 = 988$;
再算$1300 - 988 = 312$。
综上,答案依次为$\frac{3}{8}$;$\frac{2}{15}$;$324$;$\frac{1}{2}$;$2$;$\frac{1}{2}$;$18\frac{2}{3}$;$1$;$16$;$\frac{1}{8}$;$\frac{41}{60}$;$18\frac{5}{7}$;$\frac{97}{4}$;$\frac{11}{12}$;$\frac{7}{12}$;$\frac{10}{3}$;$\frac{8}{5}$;$312$。