Question

Exercițiile încercuite plss

Answer 1

[tex]1)\\M_g=\sqrt{(\sqrt{5}+1)*(\sqrt{5}-1)}=\sqrt{(\sqrt{5})^{2}-1^{2}}= \sqrt{5-1}=\sqrt{4}=2\\Am\ folosit:\\(a+b)*(a-b)=a^{2}-b^{2}\\2)\\ (-\frac{1}{2})^{0}=1\\5^{-1}=\frac{1}{5}\\1\ intreg\ si\ \frac{1}{2}=\frac{1*2+1}{2}= \frac{3}{2}\\1+3*\frac{1}{5}+\frac{3}{2}=1+\frac{3}{5}+\frac{3}{2}= \frac{10}{10}+\frac{6}{10}+\frac{15}{10}=\frac{10+6+15}{10}=\frac{31}{10}=3,1\\ 3)\\|2x+3|=5\\Cazul\ 1:\\2x+3=5\\2x=2\\x=1\\Cazul\ 2:\\2x+3=-5\\2x=-8\\ x=-4\\x=1;-4\\4)\\Perimet=4l=100cm\\l=\frac{100}{4}=25cm\\Aria=25cm*25cm=625cm^{2}[/tex]