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第76頁

信息發(fā)布者：
?$=\frac {13}{12}-\frac {5}{12}$?
?$=\frac {2}{3}$?
?$=\frac {71}{63}-\frac {5}{9}$?
?$=\frac {4}{7}$?
$\begin {aligned}解：x&=\frac {1}{2}-\frac {1}{3}\\x &=\frac {1}{6}\end {aligned}$
$\begin {aligned}解：2x&=\frac {2}{3}+\frac {7}{3}\\2x&=3\\x &=1.5\end {aligned}$
?$1-\frac {1}{3}-\frac {3}{8}=\frac {7}{24}$?
答：一二年級(jí)留言條數(shù)占總條數(shù)的?$\frac {7}{24}。$?
?$\frac {4}{5}$? + ?$\frac {7}{8}$?=?$\frac {67}{40}$? 
?$\frac {67}{40}$? -1=?$\frac {27}{40}$?
答：兩種報(bào)紙都訂閱的占全班的?$\frac {27}{40}。$?
?$\frac {12}{5}+\frac {9}{4}=\frac {93}{20}($?米)
?$\frac {12}{5}-\frac {9}{4}=\frac {3}{20}($?米)
答：可能是?$\frac {93}{20}$?米或?$\frac {3}{20}$?米。
?$\frac {1}{2}$? + ?$\frac {3}{5}$? -1=?$\frac {1}{10}$?
答：超額完成了計(jì)劃的?$\frac {1}{10}。$?
?$\frac {4}{3}$? + ?$\frac {5}{4}$?-?$\frac {3}{2}$?=?$\frac {13}{12}$? (米)
答：第二根繩子長(zhǎng)?$\frac {13}{12}$?米。
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