⑴根号下4-2根号3
=√(3-2√3+1)
=√(√3-1)²
=√3-1
⑵根号下9-4根号5
=√(5-4√5+4)
=√(√5-√4)²
=√5-√4
=√5-2
⑶根号下19-4根号15
=√(15-4√15+4)
=√(√15-√4)²
=√15-√4
=√15-2
⑴根号下4-2根号3
=√(3-2√3+1)
=√(√3-1)²
=√3-1
⑵根号下9-4根号5
=√(5-4√5+4)
=√(√5-√4)²
=√5-√4
=√5-2
⑶根号下19-4根号15
=√(15-4√15+4)
=√(√15-√4)²
=√15-√4
=√15-2