x : 12 + x . 12 + x : 12 . 5 = 12300
x . 1/12 + x . 12 + x . 5/12 = 12300
x . 1/2 + x . 12 = 12300
x . 25/2 = 12300
x = 12300 : 25/2
x = 984
Vậy x = 984.
X:12+Xx12+X:12x5=12300
X x \(\frac{1}{12}\)+ X x 12 + X x \(\frac{5}{12}\)= 12300
X x \(\frac{1}{2}\) + X x 12 = 12300
X x \(\frac{25}{2}\) = 12300
X = 12300 : \(\frac{25}{2}\)
X=984
X* 1/12+X*12+X*1/12*5=12300
X*(1/12+12+5/12)=12300
X*25/2=12300
X=12300:25/2
X=984