多项式x²y-y²z+z²x-x²z+y²x+z²y-2xy
若x-y=6,xy=-8,求代数式(x+y+z)²+(x-y-z)(x-y+z)-2·z(x+y)的值
对于任何整数m,多项式(4m+5)²-9都能被几整除 多项式(x+y-z)(x-y+z)-(y+Z-x)(z-
-2x²y(3xy²z-2y²z)
-2x²y(3xy²z-2y平方z)
已知实数x,y,z满足x²-6xy+10y²+4y+|z²-3z+2|+4=0,求(x+y
已知x y z 满足x+y=5,z²=xy+y-9,求x+2y+3z的值
已知实数x,y,z,满足x+y=5,z²=xy+y=9,求x+2y+3Z的值
x,y,z属于正实数,则x+3y-z=0,则z²/xy的最小值是
因式分解x²-y²-z²+2xy
(x-3y+2z)²=
已知x²+y²+z²-2x+4y-6z+14=0,求x+y-z/x+y+z的值
已知x,y,z满足x+y+2z=1,x²+y²+6z+1.5=0,求x,y,z的值