1/3x-[1/2y-3(x-1/2y)]其中x=6 y=-1/2

问题描述:

1/3x-[1/2y-3(x-1/2y)]其中x=6 y=-1/2

1/3x-[1/2y-3(x-1/2y)]
=1/3x-1/2y+3x-3/2y
=10/3x-2y