已知x+2y-3x=-1/3,xyz=2,求3/2x²yz+3xy²z-9/2xyz的值 help~
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已知x+2y-3x=-1/3,xyz=2,求3/2x²yz+3xy²z-9/2xyz的值 help~
已知x+2y-3x=-1/3,xyz=2,求3/2x²yz+3xy²z-9/2xyz的值 help~
已知x+2y-3x=-1/3,xyz=2,求3/2x²yz+3xy²z-9/2xyz的值 help~
3/2x²yz+3xy²z-9/2xyz
=3/2xyz(x+2y-3z)
=3/2*2*(-1/3)
=-1
x+2y-3x=-1/3,即2y-2x=-1/3,y=x-1/6
3/2x²yz+3xy²z-9/2xyz
=xyz(3x/2+3y-9/2)
=2(3x/2+3(x-1/6)-9/2)
=2(3x/2+3x-1/2-9/2)
=2(3x/2+3x-10/2)
=3x+6x-10
=9x-10
已知xyz适合关系式√3x+y-z-2+√2x+y-z=√x+y-2011+2011-x-y,试求xyz的值
(2x^3-xyz)-2(x^3-y^3+xyz)+(xyz-2y^3),其中x=-1,y=-2,z=-3.
先化简再求值3xyz+2(x^2y+y^2z-xyz)-xyz+2z^2x x=1 y= -1 z=2
(2x³-xyz)-2(x³-y³+xyz)+(xyz-3y³) x=1 y=-2 z=-3
化简求值:(2x³-xyz)-2(x³-y³+xyz)+(xyz-2y³),x=1,y=2,z=-3
先化简,再求值:3xyz+2(x²y+y²z-xyz)-xyz+2z²x,其中x=1、y=-1、z=2;
化简求值(2x^3-xyz)-2(x^3-y^3+xyz)+(xyz-2y^3)=?
xyz-【2xy-(3xyz-yz)+4xyz】,其中x=2,y=-1/2,z=-1
xyz-【2xy-(3xyz-yz)+4xyz】,其中x=2,y=-1/2,z=-1
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已知x+2y-3x=-1/3,xyz=2,求3/2x²yz+3xy²z-9/2xyz的值 help~
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