x,y,z成等差,(x+y)/2,(x+z)/4,(y+z)/6成等比,求公比q打错了，是（y+z）/8 答案为1或1/3,怎做？

lg2与lg5的等差中项是（ ）.若x,y,z成等比数列,则（z-x）∧2+4（x-y）（y-x）= x,y,z成等差,(x+y)/2,(x+z)/4,(y+z)/6成等比,求公比q打错了，是（y+z）/8 答案为1或1/3,怎做？ 已知xyz成等比数列,a是x,y的等差中项,b是y,z的等差中项,则x/a+z/b=? 实数x,y,z成等比且xyz=216,又x,y+4,z成等差,则x+y+z= 化简(x+Y)^2(y+z-x)(z+x-y)+(x-y)^2(x+y+z)(x+y-z) 计算题(x+y)^2(y+z-x)(z+x-y)+(x-y)^2(x+y+z)(x+y-z). 1、y-x/x²-y²2、(x-y)(y-z)(z-x)/(z-y)(y-x)(x-z) 若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-z)= 化简(y-x)(z-x)/(x-2y+z)(x+y-2z)+（z-y)(x-y)/(x-2z+y)(y+z-2x)+(x-z)(y-z)/(y+z-2x)(x-2y+z) 计算:(y-x)(z-x)/(x-2y+z)(x+y-2z)+(z-y)(x-y)/(x+y-2z)(y+z-2x)+(x-z)(y-z)/(y+z-2x)(x-2y+z) 若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-x)= 计算:x^2/(x-y)(x-z)+y^2/(y-x)(y-z)+z^2/(z-x)(z-y) 化简(y-x)(z-x)/(x-2y+z)(x+y-2z)+（z-y)(x-y)/(xy-2z)(y+z-2x)+(x-z)(y-z)/(y+z-2x)(x-2y+z)速速回答 用行列式的性质证明：y+z z+x x+y x y z x+y y+z z+x =2 z x y z+x x+y y+z y z x 这个怎么证? 化简:(2x-y-z)/(x-y)(x-z)+(2y-z-x)/(y-z)(y-x)+(2z-x-y)/(z-x)(z-y)化简:(2x-y-z)/(x-y)(x-z)+(2y-z-x)/(y-z)(y-x)+(2z-x-y)/(z-x)(z-y)我知道把分母化成一样的、但是之后怎么算? 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)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)不是+是 * (X+Z)(X-Z)+x(X+2Y)怎么解? 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)