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a)
![1) \frac{5}{6} *(-0,3)= \frac{5}{6} *(- \frac{3}{10} )= -\frac{1}{4} \\ 2) \frac{4}{5} :1 \frac{1}{15} = \frac{4}{5}: \frac{16}{15} = \frac{4}{5} * \frac{15}{16} = \frac{3}{4} \\ 3)- \frac{1}{4} - \frac{3}{4} =-1 \\ \\ b) \\ 1) (- \frac{4}{5}) ^{2} =- \frac{4}{5} *(- \frac{4}{5} )= \frac{16}{25} \\ 2) \frac{16}{25}*1 \frac{9}{16}= \frac{16}{25} * \frac{25}{16} =1 \\ 3)1*(-2)=-2 1) \frac{5}{6} *(-0,3)= \frac{5}{6} *(- \frac{3}{10} )= -\frac{1}{4} \\ 2) \frac{4}{5} :1 \frac{1}{15} = \frac{4}{5}: \frac{16}{15} = \frac{4}{5} * \frac{15}{16} = \frac{3}{4} \\ 3)- \frac{1}{4} - \frac{3}{4} =-1 \\ \\ b) \\ 1) (- \frac{4}{5}) ^{2} =- \frac{4}{5} *(- \frac{4}{5} )= \frac{16}{25} \\ 2) \frac{16}{25}*1 \frac{9}{16}= \frac{16}{25} * \frac{25}{16} =1 \\ 3)1*(-2)=-2](https://tex.z-dn.net/?f=1%29+%5Cfrac%7B5%7D%7B6%7D+%2A%28-0%2C3%29%3D+%5Cfrac%7B5%7D%7B6%7D+%2A%28-+%5Cfrac%7B3%7D%7B10%7D+%29%3D+-%5Cfrac%7B1%7D%7B4%7D++%5C%5C+2%29+%5Cfrac%7B4%7D%7B5%7D+%3A1+%5Cfrac%7B1%7D%7B15%7D+%3D+%5Cfrac%7B4%7D%7B5%7D%3A+%5Cfrac%7B16%7D%7B15%7D+%3D+%5Cfrac%7B4%7D%7B5%7D++%2A+%5Cfrac%7B15%7D%7B16%7D+%3D+%5Cfrac%7B3%7D%7B4%7D++%5C%5C+3%29-+%5Cfrac%7B1%7D%7B4%7D+-+%5Cfrac%7B3%7D%7B4%7D+%3D-1+%5C%5C++%5C%5C+b%29+%5C%5C+1%29++%28-+%5Cfrac%7B4%7D%7B5%7D%29+%5E%7B2%7D+%3D-+%5Cfrac%7B4%7D%7B5%7D+%2A%28-+%5Cfrac%7B4%7D%7B5%7D+%29%3D+%5Cfrac%7B16%7D%7B25%7D++%5C%5C+2%29+%5Cfrac%7B16%7D%7B25%7D%2A1+%5Cfrac%7B9%7D%7B16%7D%3D+%5Cfrac%7B16%7D%7B25%7D++%2A+%5Cfrac%7B25%7D%7B16%7D+%3D1+%5C%5C+3%291%2A%28-2%29%3D-2+)
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jekadva:
под б) не верно
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