z.29,str.156 a) 1/2(3a-2)= b) 2/3(1,5+r)= c) k(31+2m)= d) -p(9r-5s)=

a) 1/2(3a-2)=3/2a-1= 1 i 1/2s-1 b) 2/3(1,5+r)=2/3*3/2+2/3r= 2/3r + 1 c) k(31+2m)= 31k+2km d) -p(9r-5s)= -9pr+5ps

a)1½a-1 b)1+⅔r c)31k+2mk d)-9rp+5sp