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第37頁(yè)

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8
5
?$4\frac {1}{16}$?
?$\frac {9}{16}$?
6.4
0.7
?$\frac {1}{2}$?
?$\frac {2}{13}$?
$\begin {aligned}解： 0.25x&=0.36×0.75\\0.25x&=0.27\\x &=1.08\end {aligned}$
$\begin {aligned}解： \frac {1}{6}x&=15×\frac {4}{9}\\\frac {1}{6}x&=\frac {20}{3}\\x &=40\end {aligned}$
$\begin {aligned}解： 135+5x&=180\\5x&=45\\x &=9\end {aligned}$
$\begin {aligned}解： \frac {1}{4}x&=\frac {2}{3}-\frac {5}{9}\\\frac {1}{4}x&=\frac {1}{9}\\x &=\frac {4}{9}\end {aligned}$
$\begin {aligned}解： 2x-2&=18×7\\2x-2&=126\\2x&=128\\x &=64\end {aligned}$
$\begin {aligned}解： 0.65x&=0.52\\x &=0.8\end {aligned}$
?$ =(21.7+7.3)-(\frac {3}{7}+\frac {11}{7})$?
?$=29-2$?
?$=27$?
=3×(150-102)
=3×48
=144
?$ =(\frac {15}{17}-\frac {7}{17})×\frac {5}{4}$?
?$=\frac {8}{17}×\frac {5}{4}$?
?$=\frac {10}{17}$?
?$=\frac {7}{12}÷[\frac {1}{2}×14]$?
?$=\frac {7}{12}÷7$?
?$=\frac {1}{12}$?
?$ =\frac {2}{13}×26+(\frac {26}{37}+\frac {11}{37})$?
?$=4+1$?
?$=5$?
=0.25×8×0.8×1.25
=(0.25×8)×(1.25×0.8)
=2×1
=2
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