计算x/y+x=y/x+z+1=z/x+y-1的值
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计算x/y+x=y/x+z+1=z/x+y-1的值计算x/y+x=y/x+z+1=z/x+y-1的值计算x/y+x=y/x+z+1=z/x+y-1的值当x+y+z不等于0时,原式=(x+y+z)/(y
计算x/y+x=y/x+z+1=z/x+y-1的值
计算x/y+x=y/x+z+1=z/x+y-1的值
计算x/y+x=y/x+z+1=z/x+y-1的值
当x+y+z不等于0时,
原式=(x+y+z)/(y+z+x+z+1+x+y-1)=1/2.(这是用的等比定理)
当x+y+z=0时,y+z=-x,所以,x/(y+z)=-1,即原式=-1.
如果没学等比定理,也可以:
设比值为k,由有:x=ky+kz,y=kx+kz+k,z=kx+ky-k.
3个等式相加得,x+y+z=2k(x+y+z),
当x+y+z不等于0时,k=1/2.
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)=?
计算x/y+x=y/x+z+1=z/x+y-1的值
(x+y-z)(x-y+z)=
计算(x+y-z)(x-y-z)
计算:(x-y+z)(-x+y+z)
X+Y+Z=?
x/y=(x+z)/(y+z)y/z=(x+y)/(x+z)
z+=x>y?++x:
(y+z)/x=(z+x)/y=(x+y)/z求x+y-z/x+y+z的值
用乘法公式计算(x+y)(x-y)+(-y-z)(-y+z)+(-x+z)(z+x)
计算:(X+y+z)(-x+y+z)(x-y+z)(x+y-z)
计算(x+y+z)(-x+y+z)(x-y+z)(x+y-z)
计算(x+y-z)(z-x-y) ,(x+y-z)(z-x+y)
{x+y-z=11 y+z-x=5 z+x-y=1
{x+y-z=11,x-y-z=-5,x-y+z=1
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?
计算:x^2/(x-y)(x-z)+y^2/(y-x)(y-z)+z^2/(z-x)(z-y)
fangchengzu:X+Z=Y 7Z=X+Y+Z X+Y+Z=14