9x^3y^2z-12x^2y+15x^5y^3分解因式

已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX.. 方程组3x-y-z=9,2x+y-2z=6,x+y+z=15 2x+3y-z=9,x+y+z=15,5x-4y-z=0 如果|x+y+z-6|+|2x+3y-z-12|+|2x-y-z|=0求x,y, 三元一次方程组,1.x-2y+z=9 2x+y+3z=10 3x+2y1.x-2y+z=92x+y+3z=103x+2y-z2.3x-5y+2z=14x+5y-z=5X-5y+3z=-23.7x+2y-z=76x-y+z=74x+3y+z=94.4x+3y-2z=-75x-6y+z=12x+z=-25.2x+3y-4z=-23x-2y+5z=262x+5z=31 2x+3y+z=13 4x^2+9y^2+z^2-2x+15y+3z=82 求x,y,z 将多项式X^2-4Y^2-9Z^2-12YZ分解成因式的积,结果是A.(x+2y-3z)(x-2y-3z)B.(x-2y-3z)(x-2y+3z)C.(x+2y+3z)(x+2y-3z)D.(x+2y+3z)(x-2y-3z) 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 2(x+y)(x+y-z)+3(y-z)(x+y-z) X=3z X+y+z=12 X+2y-2z=10 x-2y=9 x+y+z=7 2x-3y=12 X/10=Y/8=Z/9,则X+Y+Z/2Y-3Z 12x^2y^3z-8x^3y^2z+4x^2y x+y=5 2x+3y-z=9 x-y+z=4 1.（x+y-z)+(x-y+z)-(x-y-z) 2.2x-(3x-2y+3)-(5y-2) 三元一次方程：x+3y+2z=2 3x-y+2z=3 3x+2y-4z=3 2x+y-3z=11 2x-y=7 x+y+z=12还有：7x+2y-z=76x-y+z=74x+3y+z=9 好了,2x+y-3z=11 2x-y=7x+y+z=12 化简-(-3x-y+2z)-{-x+【4x-(x-y-z)-3x+2z}