Question

Đố vui :

           y x 9,9 + y : 10 = 25

Hãy tìm giá trị của y

Answer 1

y x 9 , 9 + y : 10 = 25

y x 9 , 9 + y x 0 , 1 = 25

y x ( 9 , 9 + 0 , 1 ) = 25

y x 10                   = 25

y                           = 2 , 5

Answer 2

y . 9,9 + y : 10 = 25 

y. 9,9 + y . \(\frac{1}{10}\)= 25

y. (9,9 + 0,1) = 25

y . 10 = 25

y = 2,5

Answer 3

y x 99 + y x 0,1 = 25

y x (99 + 0,1) = 25

y = 25 : 99,1

y = 0,25227

Answer 4

2,5 chac chan 1000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%