Все в корені 36*0.49

[latex] \sqrt{36*0.49}= \sqrt{6^2*(0.7)^2} =6*0.7=4.2 [/latex]

[latex] \sqrt{36*0.49} = \sqrt{14.64} =4.2 \\ \\ \\ \sqrt{36*0.49} = \sqrt{6^{2}*0.7^{2} } =6*0.7=4.2[/latex]