Question

[pham hoang anh]

Xx1999-X=1999x1997+1999

Answer 1

[soyeon_Tiểu bàng giải]

x × 1999 - x = 1999 × 1997 + 1999

x × (1999 - 1) = 1999 × (1997 + 1)

x × 1998 = 1999 × 1998

=> x = 1999

Vậy x = 1999

Answer 2

[nghĩa lê]

X x 1999 - X     = 1999 x 1997 + 1999
X x ( 1999 - 1 ) = 1999 x ( 1997 - 1 )
X x 1998          = 1999 x 1998
suy ra X = 1999