Toán Lớp 6: mn ơi;_; làm cho mk vs ạ><''
3^x+3^x+2=270
;-; nhanh lơn ạ
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Toán Lớp 6: mn ơi;_; làm cho mk vs ạ><''
3^x+3^x+2=270
;-; nhanh lơn ạ
Comments ( 2 )
3^{x} + 3^{x} . 3^{2} = 270
3^{x} . (3^{2} + 1) = 270
3^{x} . 10 = 270
3^{x} = 270 : 10 = 27
3^{x} = 27 = 3^{3}
=>x = 3
Vậy x = 3