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{[(3×a+5)×3+5]×3+5}×3+5=121​

Răspuns :

Răspuns:

{[(3×a+5)×3+5]×3+5}×3+5=121

[(9a+15+5)×3+5]×3+5=121

[(9a+20)×3+5]×3+5=121

(27a+60+5)×3+5=121

(27a+65)×3+5=121

81a+195+5=121

81a+200=121

81a=121-200

81a=-79

a= -79/81