7/√2
= 7.√2/√2.√2
= 7√2/√4
=7√2/2
1/√7
= 1.√7/√7.√7
=√7/√49
=√7/7
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7/√2
= 7.√2/√2.√2
= 7√2/√4
=7√2/2
1/√7
= 1.√7/√7.√7
=√7/√49
=√7/7