\[\boxed{\text{744.}\text{\ }\text{еуроки}\text{-}\text{ответы}\text{\ }\text{на}\text{\ }\text{пятёрку}}\]
\[\textbf{а)}\ x^{2} = a\] \[при\ a \geq 0:\ \] \[x = \pm \sqrt{a}\] \[при\ a < 0 \Longrightarrow \ \varnothing\] |
\[\textbf{б)}\ x^{2} = a^{2}\] \[x = \sqrt{a^{2}}\] \[x = \pm |a|\] \[x = \pm a\] |
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\[\textbf{в)}\ x^{2} + 4b = 0\] \[x^{2} = - 4b\] \[при\ b \leq 0,\ \ b > 0\ \ \varnothing\] \[x = \sqrt{- 4b}\text{\ \ \ \ }\] \[x = \pm 2\sqrt{- b}\] \[при\ b > 0 \Longrightarrow \varnothing\] |
\[\textbf{г)}\ x^{2} + 9b^{2} = 0\] \[x^{2} = - 9b^{2}\] \[при\ b = 0:\ \ \] \[x = 0\ \] \[при\ b \neq 0 \Longrightarrow \ \varnothing\] |