Răspuns:
2.
x=3-3=27-3=24
y=2³-2=8-2=6
[tex]\frac{x+y}{2} -\sqrt{x*y} =\frac{24+6}{2} -\sqrt{24*6}=\frac{30}{2} -\sqrt{144} =15-12=3[/tex]
3. 2L+2l=220 ⇒ L+l=110
L*l=A si (l+10)(L-20)=A ⇒
L*l-20l+10L-200=L*l
10L=200+20l /:10
L=20+2l
20+2l+l=110
3l=90 ⇒ l=30, L=80
Explicație pas cu pas:
