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Given, √(15625) = √(5*5*5*5*5*5)
= 5*5*5
= 125
Now, √(156.25) = √(15625/100)
= √{(5*5*5*5*5*5)/(10*10)}
= (5*5*5)/10
= 125/10
= 12.5
Now, √(1.5625) = √(15625/10000)
= √{(5*5*5*5*5*5)/(100*100)}
= (5*5*5)/100
= 125/100
= 1.25