5.
√14301 ≈119,58
√14490 ≈120,37
119,58<120<120,37
120∈N
120 dm=12 m
P=12×4=48 m
4.√169=13 dm
P=13×4=52 dm
3.Apodea=2200 dm²=22 m²
l gresie=1 dm=0,1 m
Aplaca gresie =0,1×0,1=0,01 m²
22 m²:0,01 m²/placa =2200 placi
2200:40 =55 cutii
22 m² × 14,80 lei/m²=325,60 lei
1.
x=m panza
y=m stofa
z=x-16,2=y+5=m matase
x-16,2=y+5
x-y=21,2
x+y+y+5=47,2
x+2y=42,2
x+2y-(x-y)=42,2-21,2
x+2y-x+y=21
3y=21
y=7 m stofa
x=21,2+7=28,2 m panza
z=7+5=12 m matase
