Решите неравенства:
1.
2.
c решением пжл.)
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![x^2-4x-18\leq0,\ \ \ D=88,\ \ \ x_{1,2}=2\ ^+_{-}\sqrt{22},\ \ \ [2-\sqrt{22};\ 2+\sqrt{22}]](https://tex.z-dn.net/?f=x%5E2-4x-18%5Cleq0%2C%5C+%5C+%5C+D%3D88%2C%5C+%5C+%5C+x_%7B1%2C2%7D%3D2%5C+%5E%2B_%7B-%7D%5Csqrt%7B22%7D%2C%5C+%5C+%5C+%5B2-%5Csqrt%7B22%7D%3B%5C+2%2B%5Csqrt%7B22%7D%5D "x^2-4x-18\leq0,\ \ \ D=88,\ \ \ x_{1,2}=2\ ^+_{-}\sqrt{22},\ \ \ [2-\sqrt{22};\ 2+\sqrt{22}]")
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![\frac{1}{8}\leq0,5^x\leq2,\ \ \ 0,5^3\leq0,5^x\leq0,5^{-1},\ \ \ \ x:\ \ [-1\ ;\ 3].](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B8%7D%5Cleq0%2C5%5Ex%5Cleq2%2C%5C+%5C+%5C+0%2C5%5E3%5Cleq0%2C5%5Ex%5Cleq0%2C5%5E%7B-1%7D%2C%5C+%5C+%5C+%5C+x%3A%5C+%5C+%5B-1%5C+%3B%5C+3%5D. "\frac{1}{8}\leq0,5^x\leq2,\ \ \ 0,5^3\leq0,5^x\leq0,5^{-1},\ \ \ \ x:\ \ [-1\ ;\ 3].")