化简3X^2y-{xyz-(2xyz-9x^2z+4x^2z)+[3x^2y+(4xyz-5x^2z-3xyz)]}等于
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化简3X^2y-{xyz-(2xyz-9x^2z+4x^2z)+[3x^2y+(4xyz-5x^2z-3xyz)]}等于( )
A 2xyz-2x^2z B 6x^2y-4xyz+2x^2z
C 6x^2y+2xyz-10x^2z D 8xyz+10x^2z
A 2xyz-2x^2z B 6x^2y-4xyz+2x^2z
C 6x^2y+2xyz-10x^2z D 8xyz+10x^2z
3X^2y-{xyz-(2xyz-9x^2z+4x^2z)+[3x^2y+(4xyz-5x^2z-3xyz)]}
=3x^2y-xyz+2xyz-9x^2z+4x^2z+3x^2y+4xyz-5x^2z-3xyz
=3x^2y+3x^2y-xyz+2xyz+4xyz-3xyz-9x^2z+4x^2z-5x^2z
=6x^2y+2xyz-10x^2z
=3x^2y-xyz+2xyz-9x^2z+4x^2z+3x^2y+4xyz-5x^2z-3xyz
=3x^2y+3x^2y-xyz+2xyz+4xyz-3xyz-9x^2z+4x^2z-5x^2z
=6x^2y+2xyz-10x^2z
化简3X^2y-{xyz-(2xyz-9x^2z+4x^2z)+[3x^2y+(4xyz-5x^2z-3xyz)]}等于
先化简再求值3xyz+2(x^2y+y^2z-xyz)-xyz+2z^2x x=1 y= -1 z=2
x:y:z=2:3:4且x+y+z=18求xyz
若 x/2等于y/3等于z/4,且x+y-z=5 求xyz的值
x+y+z=xyz,x^2=yz,xyz不等于0,证x^3大于等于3
已知xyz满足x+y+z=30,3x+y-z=50,设t=5x+4y+2z 1当t=40时,求xyz的值 2若xyz均为
因式分解 (x+y+z)^2+yz(y+z)+xyz
3x的2次方*y-{xyz-(2xyz-y的2次方*z)-4y的2次方*z+[3x的2次方-(4xyz-5y的2次方*z
x的平方减[x的平方y减(2xyz减x的平方z减3x的平方y)减4x的平方z]减xyz,其中,x等于负3,y等于2,z等
因式分解:25x y^2 z^2 (x+y-z)-30xyz(z-x-y)^2+5x y z^3 (z-x-y)
(2x^3-xyz)-2(x^3-y^3+xyz)+(xyz-2y^3),其中x=-1,y=-2,z=-3.
已知:A=2x^3-xyz,B=y^3-z^3+xyz,C=-x^3+2y^2-xyz,且(x+1)^2+|y-1|+|