ai dc ng do la ng thong minh vi day la bai toan cho hoc sinh gioi toan [chu y:day chi la dang toan loai kha thui nha]
tim x
3^x =81
2^x+3 +2^x=144
x^2 - 4x=0
thc hien phep tinh
(5^4 + 4^7) (8^9-2^7) (2^4 - 4^2)
4^3.51+4^3.49+2.(3^2 +4^2 )
tim n,biet
3^n+3 + 3^n =252
z thui phai giai het moi chon nha chi dc sai 2 cau la toi da