Răspunsuri

Cel mai inteligent răspuns!
2014-06-23T17:10:13+03:00
A) daca AF=ED, atunci PD=(AD-EF):2
DP=(10-4):2=3m

Aria (ARNDEF)= AR*RN+EF*EP+EP*PD:2*2 = X*10+4*4+3*4 = 10X+16+12 = 10X+28 = 2(5X+14)m²

b)Aria RBCN=RB*BC=(AB-X)*BC= (12-X)*10=120-10X

10X+28=120-10X
20X=92
X=4.6m

c) Daca AR=5,
Aria (ARNDEF)=10*5+28=78m²
60 redus cu 10%= 60-6=54 lei/m²
cost gresie=54*78= 4212 lei

1 5 1