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電子課本網(wǎng) › 第57頁

第57頁

信息發(fā)布者：
?$\frac {1}{6}$?
+
?$\frac {5}{6}$?
-
?$\frac {1}{9}$?
+
?$\frac {2}{9}$?
+
-
+
?$=\frac {4}{7}-\frac {3}{7}+\frac {1}{6}$?
?$=\frac {1}{7}+\frac {1}{6}$?
?$=\frac {13}{42}$?
?$=2-(\frac {7}{9}+\frac {2}{9})$?
?$=2-1$?
?$=1$?
?$=\frac {1}{4}+\frac {3}{4}+\frac {2}{5}$?
?$=1+\frac {2}{5}$?
?$=1 \frac {2}{5}$?
?$=\frac {3}{5}+\frac {2}{5}+\frac {7}{8}$?
?$=1+\frac {7}{8}$?
?$=1 \frac {7}{8}$?
?$=\frac {7}{9}-\frac {1}{9}-\frac {1}{3}$?
?$=\frac {2}{3}-\frac {1}{3}$?
?$=\frac {1}{3}$?
$=\frac {5}{6}+\frac {1}{6}-(\frac {3}{10}+\frac {3}{10})$
$=\frac {5}{6}+\frac {1}{6}-\frac {3}{5}$
$=1-\frac {3}{5}$
$= \frac {2}{5}$

?$(1)1-\frac {1}{5}-\frac {1}{10}=\frac {7}{10}$?
答：還剩下總數(shù)的?$\frac {7}{10}.$?
$(2)\frac {1}{2}-\frac {1}{5}-\frac {1}{10}=\frac {1}{5}($噸)
答：還剩下$\frac {1}{5}$噸沒有賣出.
?$\frac {2}{5}+\frac {1}{10}=\frac {1}{2}$?
答：第二天修了全長(zhǎng)的?$\frac {1}{2}。$?
?$10÷2=5 ($?千米)
答：第二天修了?$5$?千米。
第一天吃了總數(shù)的?$\frac {1}{7}，$?還剩下總數(shù)的?$\frac {6}{7}；$?
第二天吃了剩下的一半，是總數(shù)的?$\frac {3}{7}，$?則有
?$1-\frac {1}{7}-\frac {3}{7}=\frac {3}{7}$?
答：這些桃還剩下總數(shù)的?$\frac {3}{7}.$?
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