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第112頁

信息發(fā)布者：
?$\frac {3}{11}$?
②
③
?$\frac {1}{4} $?



D
?$A$?：?$\frac {5}{12}+\frac {1}{3}+\frac {1}{4}=1$?
?$B$?：?$\frac {1}{2}+\frac {1}{4}+\frac {1}{4}=1$?
?$C$?：?$\frac {1}{6}+ \frac {5}{12}+\frac {5}{12}=1 $?
?$\frac {1}{2}$?
?$\frac {3}{5}$?
?$\frac {2}{3}$?
?$\frac {1}{2}$?
?$\frac {4}{9}$?
?$\frac {1}{2}$?
?$\frac {3}{5}$?
?$\frac {7}{9}$?
?$\frac {2}{3}$?
?$\frac {7}{9}$?
?$\frac {5}{6}$?
“合成分?jǐn)?shù)”的大小介于原來兩個真分?jǐn)?shù)之間。
?$\frac {2+5}{105+87}=\frac {7}{192}$?
?$\frac {7+5}{192+87}=\frac {12}{279}=\frac {4}{93} $?
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