25 x X - X = 14040 : 45
25 x X - X x 1 = 14040 : 45
25 x X - X x 1 = 312
( 25 - 1 ) x X = 312
24 x X = 312
X = 312 : 24
X = 13.
25 x X - X= 14040 : 45
24 x X= 312
X= 312 : 24
X= 13
Vậy X=13
25 x X - X = 14040 : 45
25 x X - X = 312
25 x X - 1 x X = 312
24 x X = 312
X = 312 : 24
X = 13
25xX-X=14040:45
25xX-X=312
25xX-Xx1=312
Xx(25+1)=312
Xx26=312
X=312:26
X=12
\(25\cdot x-x=14040:45\)
\(24x=312\)
\(x=\frac{312}{24}=13\)
hok tốt .