[tex]\displaystyle\bf\\Ex.1)\\a=4\sqrt{3}\\b=2\sqrt{3}\\\\a\times b=4\sqrt{3}\times 2\sqrt{3}=8\times3=24\\\\\frac{a}{b}=\frac{4\sqrt{3}}{2\sqrt{3}}=\frac{4}{2}=2\\S=a\times b~+~\frac{a}{b}=24+2=26\\\\\\Ex.2)\\2a+b=40\\2b+4c=88~\Big|:2\\\\\cdots\cdots\cdots\cdots\cdots\\\\2a+b~~~~~~=40\\~~~~~~~~b+2c=44\\.................~~~~~~~~(Adunam~ecuatiile)\\2a+2b+2c=84~~\Big|~:2\\\\\boxed{\bf a~+~b~+~c~=42}[/tex]
