Question

va rog ajutatima la exercitiul 4incercuit dar corect si repede

Answer 1

Lungimea |----|----|----|----|
latimea     |----|                      } 420 m.

420 : 5 = 84 m ( latimea )
84 x 4 = 336 m ( Lungimea)
Verificare : 336 m + 84 m = 420 m.

Answer 2

P=420 M
L=4xl
P=L+L+l+l
4xl+4xl+l+l=420 m.
10xl=420 m.
l=420:10
l=42 m.
L=42x4
L=168 m.
P=168+168+42+42=336+84=420 m.
r: Lungimea=168 m.
   latimea = 42 m.