Question
Evaluate: $\frac{3}{7}+\frac{-4}{9}+\frac{-11}{7}+\frac{7}{9}$
✓
Answer
$ =\left(\frac{3}{7}+\frac{-11}{7}\right)+\left(\frac{-4}{9}+\frac{7}{9}\right)$
$ =\frac{3-11}{7}+\frac{-4+7}{9}$
$ =\frac{-8}{7}+\frac{3}{9}$
$ =\frac{-72+21}{63}$
$ =\frac{-51}{63}$
$ =\frac{-17}{21}$
$ =\frac{3-11}{7}+\frac{-4+7}{9}$
$ =\frac{-8}{7}+\frac{3}{9}$
| $7$ | $7, 9$ |
| $3$ | $1,9$ |
| $3$ | $1,3$ |
| $1,1$ |
$ =\frac{-51}{63}$
$ =\frac{-17}{21}$
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