第55页

信息发布者:
$\frac{3}{5}$
$4$
$\frac{1}{9}$
​$ \frac {8}{7}($​或​$1\frac {1}{7})$​
$\frac{3}{8}$
​$ 3\frac {1}{4}($​或​$\frac {13}{4})$​
$\frac{7}{10}$
$0$
​$=\frac {18}{24}-(\frac {20}{24}-\frac {3}{24})$​
​$=\frac {18}{24}-\frac {17}{24}$​
​$= \frac {1}{24}$​
​$=210×\frac {1}{21}$​
= $10$
​$=\frac {9}{7}×\frac {5}{9}$​
​$= \frac {5}{7}$​
​$=3-(\frac {6}{11}+\frac {7}{11}+\frac {9}{11})$​
​$=3-2$​
= $1$
​$=\frac {1}{9}×\frac {1}{2}$​
​$= \frac {1}{18}$​
​$=\frac {2}{7}+(\frac {4}{5}-\frac {1}{2})$​
​$=\frac {2}{7}+\frac {3}{10}$​
​$=\frac {20}{70}+\frac {21}{70}$​
​$= \frac {41}{70}$​
解​$:0.4x=10$​
​$x=10÷0.4$​
​$ x=25$​
解​$:5x+1=65$​
​$5x=64$​
​$ x=12.8$​
解​$:3x+8.5=10$​
​$3x=1.5$​
​$ x=0.5$​
解​$:0.4x=\frac {5}{8}+\frac {3}{8}$​
​$0.4x=1$​
​$ x=2.5$​