5 x X + 3,75 x X + 1,25 x X = 20
X x (5+3,75+1,25) =20
X x 10 =20
X=20:10
X=2
5 x \(x\)+3,75 x \(x\)+1,25 x \(x\)=20
=> \(x\)x(5+3,75+1,25)=20
=>\(x\)x 10=20
=>x=20:10
=> x=2
vậy \(x\)=2
5 x X + 3,75 x X + 1,25 x X = 20
(5 + 3,75 + 1,25) x X = 20
10 x X = 20
X = 20 : 10
X = 2
5 . x + 3,75 .x + 1,25 .x = 20
<=>x . (5 + 3,75 + 1,25 ) = 20
<=> x . 10 = 20
<=> x = 20 : 10
<=> x = 2
Vậy x = 2