Sper ca te-am ajutat
a) =1pe5+3pe5 =4pe5
b)=3pe6+2pe6=5pe6
c)=2pe8+5pe8=7pe8
d)=5pe10+2pe10=7pe 10
e)=1pe3+1pe3=2pe3
f)=2pe6+2pe6=4pe6
