9/7 + 4/9 =========================================================

1 bình luận về “9/7 + 4/9 =========================================================”

1.     ${\displaystyle \frac{9}{7}}$ + ${\displaystyle \frac{4}{9}}$

   = ${\displaystyle \frac{81}{63}}$ + ${\displaystyle \frac{28}{63}}$

   = ${\displaystyle \frac{81+28}{63}}$ = ${\displaystyle \frac{109}{63}}$

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