=根号15/(1/根号3+1/2倍根号3)
=根号15/(3/2倍根号3)
=根号15*2倍根号3/3
=2根号45/3
=2*3根号5/3
=2根号5
√15除以(1/√3+1/√12)
=√15/(1/√3+1/2√3)
=√15/3/2√3
=2√15/√3
=2√5
2√5
2倍根号5
√15÷(1÷√3+1÷√12)
=√15÷(1÷√3+1÷2√3)
=√15÷(2÷2√3+1÷2√3)
=(√15×2√3)÷3
=(2√45)÷3
=(2√(5×9))÷3
=2√5
够详细不?
2√5 ====2倍根号5