Question

Plis doprowadź do najprostszej postaci i oblicz

Answer 1

1) 9(3a²+5b)-15a(3b-6a)=27a²+45b-45ab+90a²=117a²+45b-45ab
  117*(-1/3)²+45*(2/3)-45*(-1/3)*(2/3)=117*(1/9)+(15*2)+(5*2)=13+30+10=53

2)4a(3b-6)-2b(6a+1)= 12ab-24a-12ab-2b=-24a-2b
-24*(-1/4)-2*(1/2)=6-1=5