1】.5√1/5+3/2√20-15/4√1/5 2】.√12+6√3/2-【√(3-9/4)-√24】 3】.4√1/2÷(-√6)×1/3√12

问题描述:

1】.5√1/5+3/2√20-15/4√1/5 2】.√12+6√3/2-【√(3-9/4)-√24】 3】.4√1/2÷(-√6)×1/3√12

1】.5√1/5+3/2√20-15/4√1/5
=√5+3√5-3/4√5
=13/4√5
2】.√12+6√3/2-【√(3-9/4)-√24】
=2√3+3√6-1/2√3+2√6
=3/2√3+5√6
3】.4√1/2÷(-√6)×1/3√12
=2√2×【1/3√12÷(-√6)】
=2√2×(-1/3√2)
=-4/3