Question

Tìm x , biết :

a. 9x - 2 . 3² = 3⁴

b.10x + 2² . 5 = 10

Answer 1

a, 9x - 2.3^2 = 3^4

=> 9x - 18 = 81

=> 9x = 99

=> x = 11

b, 10x + 2^2.5 = 10

=> 10x + 20 = 10

=> 10x = -10

=> x = - 1

Answer 2

\(9x-2\cdot3^2=3^4\)

\(\Rightarrow9x-18=81\)

\(\Rightarrow9x=81+18=99\)

\(\Rightarrow x=99:9=11\)

Answer 3

a, 9x-2.3²=81

9x-18=81

9x=81+18

9x=99

=>x=11

b,10x+20=10

10x=10-20

10x=-10

=>x= -1 

mình giải luôn đó 

k mk nha

Answer 4

Thank you