Question

Ajutati ma exercitiu 4 a si b

Answer 1

ambele puncte sunt făcute. sper sa intelgi ce am scris si daca este ceva neclar ma poti intreba

Answer 2

1-x +(2-x)/2+(3-x)/3=-(4-x)/4-(5-x)/5-(6-x)
1-x +1-x/2+1-x/3=-1+x/4-1+x/5-6+x
3-x-x/2-x/3=-8+x/4+x/5+x
11-x-x/2-x/3=x/4+x/5+x
660-60x-30x-20x=15x+12x+60x
660-110x=87x
197x=660
x=660/197


b)ABCD romb
AC∩BD={O}
AB=BD ⇒ BD=AD  ⇒ triunghiul ABD echilateral
BO=OD=6/2=3
⇒ AO=√(6²-3²)=√(36-9)=√27=3√3 ⇒ AC=2×3√3=6√3 cm