Question

Va Rog dau 20 punc si coroana

Answer 1

a)

(5a-2)²=25a²-2*5*2*a+4=25a²-20a+4

b)

(3√18+2)²=(3*3√2+2)²=(9√2+2)²=(9√2)²-2*2*9√2+2²=162-36√2+4=166-36√2

c)

x+3/x+4:x+3/x+5=x+3/x+4*x+5/x+3=(x+3)(x+5)/(x+3)(x+4)=x+5/x+4