作业帮化简：3x²-[5x-(1/2x-3)+2x²]（1）3x²-[5x-(1/2x-3)+2x²]（2）2（x+y)-1/4(x+y)+2/3(x-y)
来源：学生作业帮助网 编辑：作业帮 时间：2024/05/12 11:37:47
![化简：3x²-[5x-(1/2x-3)+2x²]（1）3x²-[5x-(1/2x-3)+2x²]（2）2（x+y)-1/4(x+y)+2/3(x-y)](/uploads/image/z/469352-56-2.jpg?t=%E5%8C%96%E7%AE%80%EF%BC%9A3x%26%23178%3B-%5B5x-%281%2F2x-3%29%2B2x%26%23178%3B%5D%EF%BC%881%EF%BC%893x%26%23178%3B-%5B5x-%281%2F2x-3%29%2B2x%26%23178%3B%5D%EF%BC%882%EF%BC%892%EF%BC%88x%2By%29-1%2F4%28x%2By%29%2B2%2F3%28x-y%29)
化简：3x²-[5x-(1/2x-3)+2x²]（1）3x²-[5x-(1/2x-3)+2x²]（2）2（x+y)-1/4(x+y)+2/3(x-y)
化简：3x²-[5x-(1/2x-3)+2x²]
（1）3x²-[5x-(1/2x-3)+2x²]
（2）2（x+y)-1/4(x+y)+2/3(x-y)
化简：3x²-[5x-(1/2x-3)+2x²]（1）3x²-[5x-(1/2x-3)+2x²]（2）2（x+y)-1/4(x+y)+2/3(x-y)
（1）3x²-[5x-(1/2x-3)+2x²]
=3x²-(5x-1/2x+3+2x²)
=3x²-9/2x-3-2x²
=x²-9/2x-3
（2）2（x+y)-1/4(x+y)+2/3(x-y)
=2x+2y-1/4x-1/4y+2/3x-2/3y
=29/12x+13/12y