X+Y=38 Y+Z=26 X+Z=54 问: X=? Y=? Z=?
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(x+y-z)(x-y+z)=
X+Y=38 Y+Z=26 X+Z=54 问: X=? Y=? Z=?
X+Y+Z=?
x/y=(x+z)/(y+z)y/z=(x+y)/(x+z)
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(y+z)/x=(z+x)/y=(x+y)/z求x+y-z/x+y+z的值
fangchengzu:X+Z=Y 7Z=X+Y+Z X+Y+Z=14
z+=x>y?++x:
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
(x-2y+z)(x+y-2z)分之(y-x)(z-x) + (x+y-2z)(y+z-2x)分之(z-y)(x-y) + (y+z-2z)(x-2y+z)分之(x-z)(y-z)=?第三部分那个是 (y+z-2x)(x-2y+z)分之(x-z)(y-z)
z=x^(y/z) 偏导数
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