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電子課本網 › 第67頁

第67頁

信息發(fā)布者：
2100
11
7.52
1.3
266
380
?$\frac {7}{12}$?
1
?$\frac {5}{3}$?
?$\frac {40}{3}$?
30
100
=450-103
=347
=5.8+4.4
=10.2
=25×8×0.4×125
=(25×0.4)×(8×125)
=10×1000
=10000
?$ =(\frac {25}{49}+\frac {23}{49})×\frac {1}{12}$?
?$=\frac {48}{49}×\frac {1}{12}$?
?$=\frac {4}{49}$?
?$ =\frac {1}{4}×4×7+\frac {3}{7}×7×4$?
?$=1×7+3×4$?
?$=7+12$?
?$=19$?
?$=\frac {3}{4}÷[\frac {21}{20}×\frac {3}{7}]$?
?$=\frac {3}{4}÷\frac {9}{20}$?
?$=\frac {5}{3}$?
$\begin {aligned}解： \frac {5}{12}x&=\frac {5}{8}\\x &=\frac {3}{2}\end {aligned}$
$\begin {aligned}解： 4x&=\frac {5}{7}×\frac {7}{15}\\4x&=\frac {1}{3}\\x &=\frac {1}{12}\end {aligned}$
$\begin {aligned}解： 0.5x&=5.2-3.5\\0.5x&=1.7\\x &=3.4\end {aligned}$
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