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第110頁(yè)

信息發(fā)布者：

A

C

A

B

$\begin {aligned}解：x&=\frac {8}{7}-\frac {3}{4}\\x &=\frac {11}{28}\end {aligned}$

$\begin {aligned}解：x&=\frac {1}{8}+\frac {11}{24}\\x &=\frac {7}{12}\end {aligned}$

$\begin {aligned}解：x&=\frac {8}{9}-\frac {5}{6}\\x &=\frac {1}{18}\end {aligned}$

$\begin {aligned}解：x&=1+\frac {1}{6}\\x &=1 \frac {1}{6}\end {aligned}$

?$=(\frac {10}{19}+\frac {9}{19})+(\frac {9}{10}+\frac {1}{10})$?

?$=1+1$?

?$=2$?

?$=(\frac {7}{5}-\frac {2}{5})-\frac {2}{7}$?

?$=1-\frac {2}{7}$?

?$=\frac {5}{7}$?

?$=(\frac {11}{8}-\frac {3}{8})-(\frac {3}{10}+\frac {7}{10})$?

?$=1-1$?

?$=0$?

?$=1-\frac {1}{2}+\frac {1}{2}-\frac {1}{3}+\frac {1}{3}-\frac {1}{4}+...+\frac {1}{9}-\frac {1}{10}$?

?$=1-\frac {1}{10}$?

?$=\frac {9}{10}$?

甲杯：25÷(100+25)=?$\frac {1}{5}$?

乙杯：15÷(75+15)=?$\frac {1}{6}$?

?$\frac {1}{5}$? > ?$\frac {1}{6}$?

答：甲杯的糖水甜一些。

( ?$\frac {3}{4}$? + ?$\frac {5}{8}$? )-?$\frac {1}{16}$?=?$\frac {21}{16}$? (噸)

答：第三天燒了?$\frac {21}{16}$?噸。

?$(57+62)÷(12+5)=7 $?

?$\frac {5×7}{12×7}$?=?$\frac {35}{84}$?

?$57-35=22$?或?$84-62=22$?

答：減去或加上的這個(gè)數(shù)是?$22。$?

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