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第79頁(yè)

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$\frac{5}{36}$
$\frac{3}{4}$
$\frac{7}{9}$
2
$1\frac{1}{5}$
?$=3-(\frac 6{13}+\frac 7{13})$?
?$=3-1$?
?$=2$?
?$=(\frac {4}{9}+\frac {5}{9})+(\frac {3}{10}+\frac {7}{10})$?
?$=1+1$?
?$=2$?
?$=\frac {9}{7}-\frac {2}{7}-\frac {1}{3}$?
?$=1-\frac {1}{3}$?
?$=\frac {2}{3}$?
?$=(\frac {8}{5}+\frac {2}{5})-(\frac {7}{8}+\frac {1}{8})$?
?$=2-1$?
?$=1$?
?$=\frac {2}{3}+\frac {1}{3}-\frac {1}{4}$?
?$=1-\frac {1}{4}$?
?$=\frac {3}{4}$?
?$=\frac {7}{8}+\frac {1}{8}-\frac {2}{3}$?
?$=1-\frac {2}{3}$?
?$=\frac {1}{3}$?
?$\frac {1}{20}$?
?$\frac {31}{20}$?
?$\frac {9}{20}$?
?$ \frac {2}{3}+\frac {1}{2}-1=\frac {1}{6}$?
答：全月超額生產(chǎn)了?$ \frac 16。$?
?$1-\frac 17-\frac 16=\frac {29}{42}$?
答：種蘋果樹的面積占這塊地的?$\frac {29}{42}。$?
2
C
?$4÷8=\frac 12$?
?$2÷6=\frac 13$?
?$\frac 12+\frac 13=\frac {5}{6}$?
答：水位應(yīng)到達(dá)的位置在?$P$?處。
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