2√2(2√12+4√1/8-3√48)=2√2(2√(3*4)+√(2/16)-3√(3*16)=2√2*(2*2√3 + 1/4√2 - 3*4√3)=2√2 * (4√3+1/4√2-12√3)=2√2*(1/4√2-8√3)=2√2 * 1/4√2 - 2√2*8√3=1-16√6你可能算错了...