(1/2)的负1/2次幂×【﹣4的1/2次幂-（﹣1/2）的1/3次幂】的负3/4次幂
=(2)的1/2次幂×【﹣2*（-2）^(-1/3)】^(-3/4)
=2^(1/2)×[2^(2/3)]^(-3/4)
=2^(1/2)×2^(-1/2)
=2^0
=1