1.(3x²-2)-(4x²-2x-3)+(2x²-1)其中x=-2 2.3x²y-{2x²y-(2xyz-x²z)-xyz}其中x=-2.y=-3.z=1
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/14 05:19:42
![1.(3x²-2)-(4x²-2x-3)+(2x²-1)其中x=-2 2.3x²y-{2x²y-(2xyz-x²z)-xyz}其中x=-2.y=-3.z=1](/uploads/image/z/1720247-23-7.jpg?t=1.%EF%BC%883x%26%23178%3B-2%EF%BC%89-%EF%BC%884x%26%23178%3B-2x-3%EF%BC%89%2B%EF%BC%882x%26%23178%3B-1%EF%BC%89%E5%85%B6%E4%B8%ADx%3D-2+++++++++++++2.3x%26%23178%3By-%7B2x%26%23178%3By-%EF%BC%882xyz-x%26%23178%3Bz%EF%BC%89-xyz%7D%E5%85%B6%E4%B8%ADx%3D-2.y%3D-3.z%3D1)
1.(3x²-2)-(4x²-2x-3)+(2x²-1)其中x=-2 2.3x²y-{2x²y-(2xyz-x²z)-xyz}其中x=-2.y=-3.z=1
1.(3x²-2)-(4x²-2x-3)+(2x²-1)其中x=-2 2.3x²y-{2x²y-(2xyz-x²z)-xyz}其中x=-2.y=-3.z=1
1.(3x²-2)-(4x²-2x-3)+(2x²-1)其中x=-2 2.3x²y-{2x²y-(2xyz-x²z)-xyz}其中x=-2.y=-3.z=1
1、(3*4-2)-(4*4+4-3)+(2*4-1)=0
2、3*4*(-3)-{2*4*(-3)-[2*(-2)*(-3)*1-4*1]-(-2)*(-3)*1}=-36-{-24-[12-4]-6}=-36-{-24-8-6}=2
1原式=3x²-2-4x²+2x+3+2x²-1=x²+2x=x(x+2)=0
2原式=3x²y-(2x²y-2xyz+x²z-xyz)=x²y+3xyz-x²z=-12+3×6-4=2
望采纳
(3x²-2)-(4x²-2x-3)+(2x²-1)其中x=-2
=3x²-2-4x²+2x+3+2x²-1
=x(x+2)
=(-2)*(-2+2)
=0
3x²y-{2x²y-(2xyz-x²z)-xyz}其中x=-2.y=-3.z=1...
全部展开
(3x²-2)-(4x²-2x-3)+(2x²-1)其中x=-2
=3x²-2-4x²+2x+3+2x²-1
=x(x+2)
=(-2)*(-2+2)
=0
3x²y-{2x²y-(2xyz-x²z)-xyz}其中x=-2.y=-3.z=1
=3x²y-{2x²y-2xyz+x²z-xyz}
=3x²y-2x²y+2xyz-x²z+xyz
=x²y+3xyz--x²z
=x(xy+3yz-xz)
=(-2)*[(-2)*(-3)+3*(-3)*1-(-2)*1]
=2
收起
1.3x²-2-4x²+2x+3+2x²-1
=x²+2x
=0
2.3x²y-(2x²y-2xyz+x²z-xyz)
=x²+3xyz-x²z
=2