(a+2b-1)²与(2x+y+z)(2x-y-z)这两题请详解,
(a+2b-1)²与(2x+y+z)(2x-y-z)这两题请详解,
(1) (a+2b/a-b)+(b/b-a)-(2a/a-b); (2) (y/x-y+z)+(2x+z/y-x-z)-
(-2a-b)②-(-2a+b)(-b-2a) (x-y+z)(-x+y+z)+(x-y)②其中z=-1
(y-x)/(x+z-2y)(x+y-2z)+(z-y)(x-y)/(x+y-2z)(y+z-2x)+(x-z)(y-z
x,y,z正整数 x>y>z证明 x^2x +y^2y+z^2z>x^(y+z)*y^(x+z)*z^(x+y)
化简(y-x)(z-x)/(x-2y+z)(x+y-2z)+(z-y)(x-y)/(x-2z+y)(y+z-2x)+(x
(x-2y+z)(x+y-2z)分之(y-x)(z-x) + (x+y-2z)(y+z-2x)分之(z-y)(x-y)
已知 x,y,z都是正实数,且 x+y+z=xyz 证明 (y+x)/z+(y+z)/x+(z+x)/y≥2(1/x+1
三元一次方程组 {x+y-z=6 x-3y+2Z=1 3x+2y-z=3求详解过程
∮τ (y-z)dx+(z-x)dy+(x-y)dz,τ为椭圆x^2+y^2=a^2,x/a+y/b=1
计算:1:(2a-3b-c)^2 2:(3y-y-1)(y-3x-1) 3:(2x+y-z)(z-2x+y)
化简(y-x)(z-x)/(x-2y+z)(x+y-2z)+(z-y)(x-y)/(xy-2z)(y+z-2x)+(x-