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=√19+2√48
=√16+√3
=4+√3
b.√3+√2
c.√43+2(6√7)
=√43+2√252
=√36+√7
=6+√7
d.√21-4√5
=√21-2(2√5)
=√21-2√20
=√20-√1
=2√5-1
e.√21+2(4√5)
=√21+2√80
=√16+√5
=4+√5