Question

Vreau ex:21,24,25,26,27.
urgent
dau 20 puncte+coroana
timp:pana la 11:30 A.M.

Answer 1

21.
A=204 cm²;  l=0,12 m = 12;  P=?

L* l =204 cm²
l= 12cm    ⇒  L=204:12= 17
L=17
P=2*17+2*12=34+24=58 cm

24.
L=5,2 dam= 52m
l=1,25m
1 costum=2,6m²

A=L*l=52*1,25= 65m²
65m²: 2,6m²= 25 costume

25
L=112m
l=25m ⇒  Ag= 112*25= 2800 m²
Din care:
ardei (a)= 375m²
varza (b)= 8,5 m²
rosii (r) = ?

R: 2800 - ( 375+8,5)= 2800 - 383,5 = 2416,5 m²

26.
L=28 cm
l=18 cm ⇒  A=28*18= 504 cm²
/ zi= 0,14 dm² =14 cm²      ( 1dm²=100cm²)

R: 504:14= 36 zile

27.
/zi   = 1,5hm²
l= 300m  ⇒ l=3hm :  Ap= l²=9 hm²
 
R: 9:1,5= 6 zile.

Answer 2

21. 
A=Lxl=204
P=2(L+l)
0,12m=12cm
Lx12=204
L=204:12=17
P=2(17+12)=58
24.
L=5,2dam=52m
l=1.25m
A=Lxl=52x1.25=65
65:2.6=25