Question

(2/b + 3)(1 + 1/b) = 1/b + 9 x - 18 și b = - 1/3​

Answer 1

Răspuns:

(2/b + 3)(1 + 1/b) = 1/b + 9 x - 18

b = - 1/3​

[2/(-1/3)+3)·(1+1/(-1/3)]=1/(-1/3)+9x-18

[2·(-3)+3]·[1+(-3)]=(-3)+9x-18

(-6+3)·(1-3)=-21+9x

-3·(-2)=-21+9x

6+21=9x=>x=27:9=>x=3