Răspuns :
Răspuns:
a)9+9+6+6=30
9×2+6×2=30
b)14+8=22(lungimea)
14+14+22+22=72
14×2+22×2=72
c)6dm=60 cm
60÷5=12cm
60+60+12+12=144
60×2+12×2=144
Răspuns:
P-perimetru
L-lungime
l-latime
a) I
P= 2×L+2×l
P =2×9+2×6
P=18+12=30 cm
II
P=2(L+l)= 2×(9+6)=2×15=30cm
P=30cm
b) L=l+8=14+8=22
P=2×22+2×14=44+28=72cm
P=2×(14+22)=2×36=72
c) l=L×5=6×5=30
P=2×6+2×30=12+60=72
P=2×(6+30)=2×36=72