填空x+y-z=x+( )=x-( )填空x+y-z=x+()=x-()

填空x+y-z=x+( )=x-( )填空x+y-z=x+()=x-() (x-y-z)*( )=x^2-(y+z)^2 填空 填空a(x+y-z)+b(x+y-z)-c(x+y-z)=(x+y-z)乘以() (x+y-z)(x-y+z)= z+=x>y?++x: X+Y+Z=? x/y=(x+z)/(y+z)y/z=(x+y)/(x+z) 已知 x/(y+z)+y/(z+x)+z/(x+y)=1求 (x*x)/(y+z)+(y*y)/(x+z)+(z*z)/(x+y)=? 填空：（x-y-z）（_________）=x^2-（y+z）^2 (y+z)/x=(z+x)/y=(x+y)/z求x+y-z/x+y+z的值 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? x=y; y=z; z=x/y fangchengzu:X+Z=Y 7Z=X+Y+Z X+Y+Z=14 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 若z分之x+y+z=y分之x-y+z=x分之-x+y+z,求xyz分之(x+y)(y+z)(z+x) 已知 (x+y-z)/z=(x-y+z)/y=(y+z-x)/x,且xyz≠0,求代数式 ((x+y)(y+z)(x+z))/xyz x分之y+z=y分之z+x=z分之x+y(x+y+z不等于0）,求x+y+z分之x+y-z 分式加减法：已知x+y/z=x+z/y=y+z/x(x+y+z≠0）,求x+y-z/x+y+z