\(2,\\ a,=\sqrt{\dfrac{8a\left(5-a\right)^2}{a-5}}=\sqrt{\dfrac{8a\left(a-5\right)^2}{a-5}}=\sqrt{8a\left(a-5\right)}=2\sqrt{2a\left(a-5\right)}\\ b,=\sqrt{\dfrac{\left(x-7\right)^2\left(x+7\right)}{\left(7-x\right)\left(7+x\right)}}=\sqrt{\dfrac{\left(7-x\right)^2\left(x+7\right)}{\left(7-x\right)\left(7+x\right)}}=\sqrt{7-x}\\ c,=\sqrt{\dfrac{a^2b}{b^2a}}=\sqrt{\dfrac{a}{b}}=\dfrac{\sqrt{ab}}{b}\\ d,=\sqrt{\dfrac{6x^2}{x}}=\sqrt{6x}\)
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