x: 7 + x : 3 + x :10 = 24400
x: (7+3+10) =24400
x: 20 = 24400
x= 24400:20
x= 1220
Vậy...
\(\frac{x}{7}+\frac{x}{3}+\frac{x}{10}=24400\)
<=> \(x\left(\frac{1}{7}+\frac{1}{3}+\frac{1}{10}\right)=24400\)
<=> \(x.\frac{121}{210}=24400\)
=> x = \(\frac{5124000}{121}\)
X : 7 + X : 3 + X : 10 = 24400
X x 1/7 + X x 1/3 + X x 1/10 = 24400
X x (1/7 + 1/3 + 1/10) = 24400
X x 121/210 = 24400
X = 24400/(121/210)
X = 42347,10744
X : 7 + X : 3 + X : 10 = 24400
<=> X : ( 7 + 3 + 10 ) = 24400
<=> X : 20 = 24400
=> 24400 : 20
=> x = 1220
Vậy X = 1220