5*(√x/5)+0.5(√20x) +1.25*(√4/5x)
=√(5²*x/5)+√(0.5²*20x) +√[(5/4)²*4/5x]
=√5x+√5x +√(5/4x)
=2√5x +(1/2)√5x
=(5/2)√(5x)