作业帮已知A=2x²-3x+2y²,B=2x²+xy-3y²,C=x²-xy-2y².求A-{B+[C-(A-B)]}
来源：学生作业帮助网 编辑：作业帮 时间：2024/04/30 03:11:50
![已知A=2x²-3x+2y²,B=2x²+xy-3y²,C=x²-xy-2y².求A-{B+[C-(A-B)]}](/uploads/image/z/999539-35-9.jpg?t=%E5%B7%B2%E7%9F%A5A%3D2x%26%23178%3B-3x%2B2y%26%23178%3B%2CB%3D2x%26%23178%3B%2Bxy-3y%26%23178%3B%2CC%3Dx%26%23178%3B-xy-2y%26%23178%3B.%E6%B1%82A-%7BB%2B%5BC-%28A-B%29%5D%7D)
已知A=2x²-3x+2y²,B=2x²+xy-3y²,C=x²-xy-2y².求A-{B+[C-(A-B)]}
已知A=2x²-3x+2y²,B=2x²+xy-3y²,C=x²-xy-2y².求A-{B+[C-(A-B)]}
已知A=2x²-3x+2y²,B=2x²+xy-3y²,C=x²-xy-2y².求A-{B+[C-(A-B)]}
A-{B+[C-(A-B)]}
=A-{B+[C-A+B]}
=A-{B+C-A+B}
=A-2B-C+A
=2A-2B-C
=2(A-B)-C
=2(2x²-3x+2y²-2x²-xy+3y²)-(x²-xy-2y²)
=-6x+10y²-2xy-x²+xy+2y²
=12y²-xy-x²-6x