计算(25x^2y^3z-10x^3 y^2)/5x^2y*y
1.(x+y-z)+(x-y+z)-(x-y-z) 2.2x-(3x-2y+3)-(5y-2)
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
计算:3x-2y- [-4x+(z+3y)]
因式分解:25x y^2 z^2 (x+y-z)-30xyz(z-x-y)^2+5x y z^3 (z-x-y)
x/2=y/3=z/5 x+3y-z/x-3y+z
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
计算:(-x-2y) * (3x-y)
计算(x+y)(x+y)^2(-x-y)^3
运用乘法公式计算:(x+2y-3z)(x-2y+3z)
若|x-2|+|Y+3|+|z-5|=O计算求|x|+|Y|+|z|的值
2X+Y+Z=10,X+2Y+Z=-6,X+Y+2Z=8 5X+4Y-3Y=13,2X-3Y+7Z=19,3X-Y=2X
计算(x+2y-3z)的平方+(x-2y+3z)(x+2y-3z)