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Ответ дал:
1
294.
1)
![\frac{15 \times 17 - 15 \times 6}{15 \times 17 + 15 \times 6} = \frac{15(17 - 6)}{15(17 + 6)} = \frac{17 - 6}{17 + 6} = \frac{11}{23} \frac{15 \times 17 - 15 \times 6}{15 \times 17 + 15 \times 6} = \frac{15(17 - 6)}{15(17 + 6)} = \frac{17 - 6}{17 + 6} = \frac{11}{23}](https://tex.z-dn.net/?f=+%5Cfrac%7B15+%5Ctimes+17+-+15+%5Ctimes+6%7D%7B15+%5Ctimes+17+%2B+15+%5Ctimes+6%7D++%3D++%5Cfrac%7B15%2817+-+6%29%7D%7B15%2817+%2B+6%29%7D++%3D++%5Cfrac%7B17+-+6%7D%7B17+%2B+6%7D++%3D++%5Cfrac%7B11%7D%7B23%7D+)
2)
![\frac{81 \times 17 - 15 \times 81}{81 \times 17 + 81 \times 4} = \frac{81(17 - 15)}{81(17 + 4)} = \frac{17 - 15}{17 + 4} = \frac{2}{21} \frac{81 \times 17 - 15 \times 81}{81 \times 17 + 81 \times 4} = \frac{81(17 - 15)}{81(17 + 4)} = \frac{17 - 15}{17 + 4} = \frac{2}{21}](https://tex.z-dn.net/?f=+%5Cfrac%7B81+%5Ctimes+17+-+15+%5Ctimes+81%7D%7B81+%5Ctimes+17+%2B+81+%5Ctimes+4%7D++%3D++%5Cfrac%7B81%2817+-+15%29%7D%7B81%2817+%2B+4%29%7D++%3D+%5Cfrac%7B17+-+15%7D%7B17+%2B+4%7D++%3D++%5Cfrac%7B2%7D%7B21%7D+)
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Ответ дал:
0
1) 15*17-15*6/15*17+15*6= 15*(17-6)/15*(17+6)= -(17+6)/17+6= -1
fererrra:
81*17-81*15/81*17+81*4= 81*(17-15)/81*(17+4)= 17-15/17+4= 2/21
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