Question

Va rog ajutatima ,cu cele 2 exerciti din poza

Answer 1

12)
a) P =  60 dam
L=5l
P=2x(5l+l)=12l
12l=60
l=60:12
l=5 dam 
L=25dam 

b) P =  72 dm
L=5l
P=2x(5l+l)=12l
12l=72
l=72:12
l=6 dm
L=30 dm 

c) P =104,4 m
L=5l
P=2x(5l+l)=12l
12l=104,4
l=104,4:12
l=8,7m
L=43,5 m

13) 

a) P = 20 cm
l=20
L=7x20=140m
P=2x(140+20)= 2 x 160 = 320m

b) P = 44 dm
l= 44
L=7x44=308dm
P=2x(308+44)= 2 x 352 = 704dm