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第24頁

信息發(fā)布者：
$\begin {aligned}解：\frac {1}{4}x&=80\\x &=320\end {aligned}$
$\begin {aligned}解：2000x&=8\\x &=\frac {1}{250}\end {aligned}$
$\begin {aligned}解：\frac {9}{10}x&=\frac {3}{5}×\frac {2}{3}\\\frac {9}{10}x&=\frac {2}{5}\\x &=\frac {4}{9}\end {aligned}$
?$=0.25×(\frac {4}{5}+3.2)$?
?$=0.25×4$?
?$=1$?
?$=(\frac {13}{5}×\frac {8}{13})×(8×1.25)$?
?$=\frac {8}{5}×10$?
?$=16$?
?$=4-\frac {1}{5}-\frac {4}{5}$?
?$=4-1$?
?$=3$?
?$=\frac {3}{8}÷\frac {3}{8}÷\frac {9}{20}$?
?$=\frac {20}{9}$?
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