√72-√18)/√12 is equals to
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(√72-√18)÷√12
(6√2-3√2)÷2√3
3√2÷2√3
(√3×√3×√2)÷√2×√2×√3 ( :- 3=√3×√3 ; 2=√2×√2 )
now ,
√3 and √2 will be cancelled in both numerator and denominator .
√3÷√2 =√(3÷2) .
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