prove that
![\frac{ {2}^{30 } + {2}^{29} + {2}^{28} }{ {2}^{31} + {2}^{30} + {29}^{29} } = \frac{7}{10} \frac{ {2}^{30 } + {2}^{29} + {2}^{28} }{ {2}^{31} + {2}^{30} + {29}^{29} } = \frac{7}{10}](https://tex.z-dn.net/?f=+%5Cfrac%7B+%7B2%7D%5E%7B30+%7D+%2B+%7B2%7D%5E%7B29%7D+%2B+%7B2%7D%5E%7B28%7D++%7D%7B+%7B2%7D%5E%7B31%7D+%2B++%7B2%7D%5E%7B30%7D+%2B++%7B29%7D%5E%7B29%7D++%7D++%3D++%5Cfrac%7B7%7D%7B10%7D+)
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see this ...............
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