12 si 13 pls pls pls pls pls

12 Si 13 Pls Pls Pls Pls Pls class=

Răspuns :

13). P=2 ×(L+l)=2×(0,60hm+400dm)=2×460=960

12).
a)5×8=40
b)P=2×(L+l)=2×(5+8)=2×13=26
c)8×2+5×2=16+10=26