2√12-4√1/27+3√48
=4√3-4/3√1/3+12√3
=16√3-4/9√3
=140/9√3根号下4/3√1/3怎么变成4/9√3的4/3√(1/3)=4/3√(3/3*3)=4/3√(3/3²)=4/3*3√3=4/9√3