x+y+z＝13,y-x＝2,100x+z+10y+x＝99

x+y+z＝13,y-x＝2,100x+z+10y+x＝99 x=y/z=z/3,x+y+z ＝12,求2x+3y+4z是多少, |3X-2Y|+√Y-2Z＝0求X/Y+Y/Z+Z/X的值 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) 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) x：y＝9：8 x：z＝3：2求x,y,z的值. 若x+2y-4z＝0 3x+y-z＝0 求x：y：z 已知：x+y+z＝3y＝2z,求x分之x+y+z的值 计算:x^2/(x-y)(x-z)+y^2/(y-x)(y-z)+z^2/(z-x)(z-y) 若X Y Z 满足方程组 X-2Y＋3Z＝0 2X-3Y＋4Z＝0 则 X：Y：Z ＝? 已知x,y,z∈（0,+∞）求证：√x^+xy+y^+√y^+yz+z^+√z^+zx+x^＞＝3/2(x+y+z ) x+y+z=12 x-y+z=2 x-z+y+a=90 x+y+a+z=100,求x y z a 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?