[(-3)的2次方-2的2次方-(-5)的2次方]*5/6/4/9*(-2)的4次方
=[9-4-25]*5/6/4/9*16
=-20*5/6/4/9*16
=-50/3*9/4*16
=-75/2*16
=-600
[-1/3*(-1/2)+(-1/9)/2/3]/(-2)的3次方
=[1/6-1/6]/9
=0/9
=0