( X . 0,25 + 1999).2000 = (53 + 1999).2000
=> X . 0,25 +1999 = 53+1999
=> X . 0,25 = 53
=> X = 53 : 0,25 = 53 . \(\frac{1}{4}\)
=> X = \(\frac{53}{4}\)
(x.0,25+1999) . 2000=(53+1999) . 2000
(x.0,25+1999) . 2000= 2052 . 2000
(x.0,25+1999) . 2000= 4104000
x.0,25+1999 = 4104000 : 2000
x.0,25+1999 = 2052
x.0,25 = 2052-1999
x.0,25 = 53
x = 53:0.25
x = 212
Vậy x=212.