电子课本网 第2页

第2页

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C
D
C
A
C
​$=\frac {6}{7}+\frac {1}{7}+\frac {3}{4}$​
​$=1+\frac {3}{4}$​
​$= 1\frac {3}{4}$​
​$=\frac {7}{8}-\frac {1}{10}$​
​$=\frac {35}{40}-\frac {4}{40}$​
​$= \frac {31}{40}$​
​$=(\frac {1}{8}+\frac {1}{8})+(\frac {4}{7}+\frac {3}{7})$​
​$=\frac {1}{4}+1$​
= $1\frac{1}{4}$
​$=1-\frac {19}{30}$​
​$= \frac {11}{30}$​
​$=\frac {13}{10}-(\frac {2}{9}+\frac {7}{9})$​
​$=\frac {13}{10}-1$​
​$= \frac {3}{10}$​
​$=\frac {50}{60}+\frac {45}{60}-\frac {24}{60}$​
​$=\frac {95}{60}-\frac {24}{60}$​
​$= \frac {71}{60}$​