电子课本网 第122页

第122页

信息发布者:
×
9
$1\frac{2}{3}$
$\frac{1}{6}$
9
$1\frac{5}{12}$
$\frac{2}{7}$
$5\frac{1}{4}$
$\frac{1}{2}$
​$=\frac {3}{5}×\frac {1}{4}+\frac {2}{5}×\frac {1}{4}$​
​$=(\frac {3}{5}+\frac {2}{5})×\frac {1}{4}$​
​$=\frac {1}{4}$​
​$=\frac {8}{9}×(\frac {3}{4}×\frac {15}{8})$​
​$=\frac {5}{4}$​
​$=\frac {2}{3}×12+\frac {1}{4}×12-\frac {5}{6}×12$​
​$=8+3-10$​
​$=1 $​