\(17,\left(-2\right)^x=-0,5\)
\(\left(-2\right)^x=-\dfrac{1}{2}\)
\(\left(-2\right)^x=\left(-2\right)^{-1}\)
\(x=-1\)
\(18,\left(-2\right)^x=-0,125\)
\(\left(-2\right)^x=-\dfrac{1}{8}\)
\(\left(-2\right)^x=-\dfrac{1}{2^3}\)
\(\left(-2\right)^x=\left(-2\right)^{-3}\)
\(x=-3\)
\(19,\left(-8\right)^x=-0,125\)
\(\left(-8\right)^x=-\dfrac{1}{8}\)
\(\left(-8\right)^x=\left(-8\right)^{-1}\)
\(x=-1\)
\(20,\left(-5\right)^x=-0,2\)
\(\left(-5\right)^x=-\dfrac{1}{5}\)
\(\left(-5\right)^x=\left(-5\right)^{-1}\)
\(x=-1\)
\(21,\left(-40\right)^x=-0,025\)
\(\left(-40\right)^x=-\dfrac{1}{40}\)
\(\left(-40\right)^x=\left(-40\right)^{-1}\)
\(x=-1\)
\(22,\left(-50\right)^x=-0,02\)
\(\left(-50\right)^x=-\dfrac{1}{50}\)
\(\left(-50\right)^x=\left(-50\right)^{-1}\)
\(x=-1\)