第71页

信息发布者:
$2-\frac{8}{15}×\frac{9}{16}$
$=2-\frac{3}{10}$
$=1\frac{7}{10}$
$1-\frac{8}{9}×\frac{3}{8}×\frac{1}{7}$
$=1-\frac{1}{3}×\frac{1}{7}$
$=1-\frac{1}{21}$
$=\frac{20}{21}$
$[1-(\frac{3}{4}-\frac{3}{8})]÷\frac{5}{6}$
$=[1-\frac{3}{8}]×\frac{6}{5}$
$=\frac{5}{8}×\frac{6}{5}$
$=\frac{3}{4}$
$5-(\frac{6}{7}÷\frac{3}{14}+\frac{6}{13})$
$=5-(\frac{6}{7}×\frac{14}{3}+\frac{6}{13})$
$=5-4-\frac{6}{13}$
$=\frac{7}{13}$
$6÷(\frac{3}{5}+\frac{3}{4})$
$=6÷(\frac{12}{20}+\frac{15}{20})$
$=6÷\frac{27}{20}$
$=6×\frac{20}{27}$
$=\frac{40}{9}$
$1-\frac{6}{7}÷\frac{3}{7}×\frac{3}{16}$
$=1-\frac{6}{7}×\frac{7}{3}×\frac{3}{16}$
$=1-2×\frac{3}{16}$
$=1-\frac{3}{8}$
$=\frac{5}{8}$
$=\left(\frac{6}{5}+\frac{4}{5}\right)\times\frac{2}{15}$
$=2\times\frac{2}{15}$
$=\frac{4}{15}$
$=\frac{6}{11}\times\frac{1}{4}-\frac{1}{4}\times\frac{5}{11}$
$=\frac{1}{4}\times\left(\frac{6}{11}-\frac{5}{11}\right)$
$=\frac{1}{4}\times\frac{1}{11}$
$=\frac{1}{44}$
$=\left(\frac{7}{11}+\frac{4}{11}\right)\times\frac{7}{9}$
$=1\times\frac{7}{9}$
$=\frac{7}{9}$
$=\frac{32}{33}\times(33-1)$
$=\frac{32}{33}\times33-\frac{32}{33}\times1$
$=32-\frac{32}{33}$
$=31\frac{1}{33}$
$​ =(\frac 65+\frac 45)×\frac 2{15}​$
$​ =2×\frac 2{15}​$
$​ =\frac 4{15}​$
$​ =\frac 6{11}×\frac 14-\frac 14×\frac 5{11}​$
$​ =\frac 14×(\frac 6{11}-\frac 5{11})​$
$​ =\frac 14×\frac 1{11}​$
$​ =\frac 1{44}​$
$​ =(\frac 7{11}+\frac 4{11})×\frac 79​$
$​ =1×\frac 79​$
$​ =\frac 79​$
$​ =\frac {32}{33}×(33-1)​$
$​ =\frac {32}{33}×33-\frac {32}{33}​$
$​ =32-\frac {32}{33}​$
$​ =31\frac 1{33}​$