質問: Tìm x €N, biết a) (x+14):12-6=4 b)(x+35)-120=0 c)(15+x):3=3mũ6:3mũ3 d)5mũ x.5mũ2=5mũ6
回答: a, `(x+14):12-6=4` `=> (x+14) : 12 = 8` `=> x + 14 = 8 . 12 = 96` `=> x = 82` b,` (x+35)-120=0` `=> x + 35 = 120` `=> x = 85` c, `(15+x):3=3^6 : 3^3` `=> (15+x):3=3^3` `=> 15 + x = 3^4 = 81` `=> x = 66` d, `5^x . 5^2 = 5^6` `=> 5^(x+2)=5^6` `=> x + 2 = 6` `=> x = 4`