作业帮1/2x-[(2x-2/3y²)-(-3/2x+1/3y²)],其中x=1/4,y=-1
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/05 07:29:00
![1/2x-[(2x-2/3y²)-(-3/2x+1/3y²)],其中x=1/4,y=-1](/uploads/image/z/1002747-3-7.jpg?t=1%2F2x-%5B%282x-2%2F3y%26%23178%3B%29-%28-3%2F2x%2B1%2F3y%26%23178%3B%29%5D%2C%E5%85%B6%E4%B8%ADx%3D1%2F4%2Cy%3D-1)
1/2x-[(2x-2/3y²)-(-3/2x+1/3y²)],其中x=1/4,y=-1
1/2x-[(2x-2/3y²)-(-3/2x+1/3y²)],其中x=1/4,y=-1
1/2x-[(2x-2/3y²)-(-3/2x+1/3y²)],其中x=1/4,y=-1
原式=1/2x-(2x-2/3y²+3/2x-1/3y²)
=1/2x-(7/2x-y²)
=1/2x-7/2x+y²
=-3x+y²
=-3×1/4+(-1)²
=1/4