Question

Tìm x ∈ N, biết: ( 17x - 25 ) : 8 + 65 = 9² ( giải giùm mình nhé )

Answer 1

\(\left(17x-25\right):8+65=9^2\)

=> \(\frac{17x}{8}-\frac{25}{8}+65=81\)

=> \(\frac{17x}{8}=81-65+\frac{25}{8}\)

=> \(\frac{17x}{8}=\frac{153}{8}\)

=> \(17x=\left(153.8\right):8\)

=> \(17x=153\)

=> \(x=153:17=9\)

Answer 2

(17x - 25 ) : 8 + 65 = 9²     

(17x - 25 ) : 8 + 65 = 81

(17x - 25) : 8 = 81 - 65 = 16

17x - 25 = 16 x 8 = 128

17x = 128+25=153

x= 153:17 =9