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第56頁

信息發(fā)布者：
?$=\frac {8}{24}+\frac {9}{24}$?
?$=\frac {17}{24}$?
?$=\frac {5}{5}-\frac {2}{5}$?
?$=\frac {3}{5}$?
?$=\frac {9}{15}-\frac {7}{15}$?
?$=\frac {2}{15}$?
?$=\frac {7}{14}-\frac {6}{14}$?
?$=\frac {1}{14}$?
?$=\frac {54}{63}-\frac {35}{63}$?
?$=\frac {19}{63}$?
?$=\frac {49}{28}+\frac {4}{28}$?
?$=\frac {53}{28}$?
$\begin{aligned}解：x&=\frac {5}{9}+\frac {2}{3}\\x&=\frac {11}{9}\end{aligned}$
$\begin{aligned}解：x&=\frac {4}{5}-\frac {5}{8}\\x&=\frac {7}{40}\end{aligned}$
$\begin{aligned}解：x&=1-\frac {3}{7}\\x&= \frac {4}{7}\end{aligned}$
$\frac{8}{15}$
$\frac{13}{40}$
$\frac{14}{45}$
$\frac{2}{15}$
$\frac{3}{40}$
$\frac{4}{45}$
分子為1的兩個(gè)分?jǐn)?shù)相加減,其結(jié)果
的分母為兩個(gè)分母相乘,分子為兩
個(gè)分母相加減。
?$250$?克?$= \frac {1}{4}$?千克
?$600$?克?$= \frac {3}{5}$?千克
?$ \frac {3}{5}+ \frac {1}{4}= \frac {17}{20}($?千克)
?$\frac {3}{5}- \frac {1}{4}= \frac {7}{20}($?千克)
答：兩種餅干的質(zhì)量一共是?$ \frac {17}{20}$?千克，大盒餅干比小包餅干多?$ \frac {7}{20}$?千克.

?$\frac {17}{20}+\frac {3}{5}+\frac {17}{20}=\frac {23}{10}($?噸)
答：這批貨物一共有?$\frac {23}{10}$?噸.
$\frac {7}{8}-\frac {1}{2}+\frac {3}{4}$
$=\frac {7}{8}-\frac {4}{8}+\frac {6}{8}$
$=\frac {9}{8}$
答：運(yùn)來香蕉$\frac {9}{8}$噸.

?$1-\frac {3} {8}×2$?
?$=1-\frac {3} {4}$?
?$=\frac {1} {4} ({米} )$?
答：它的底邊長(zhǎng)是?$\frac {1} {4}$?米.
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