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電子課本網(wǎng) 第122頁

第122頁

信息發(fā)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 $?