Răspuns:
Explicație pas cu pas:
[tex]a=\frac{450}{212}*[\frac{16-1}{9}+\sqrt{\frac{137-13}{90} *\frac{34-3}{90} }]=\frac{225}{106}*[\frac{15}{9}+\sqrt{\frac{124}{90} *\frac{31}{90} }]=\frac{225}{106}*[\frac{15}{9}+\frac{31*2}{90} ]=\frac{225}{106}*\frac{150+62}{90} =\frac{225}{106}*\frac{212}{90}=\frac{225}{106}*\frac{106}{45}=5\\b=\sqrt{412,09}-0,3=20,3-0,3=20\\ ma=\frac{a+b}{2}=12,5\\ mg=\sqrt{a*b}=\sqrt{100}=10\\x=\frac{16*ma}{mg}=\frac{16*12,5}{10}=\frac{8*25}{10}=20[/tex]