已知3X-4Y-Z=0,2X+Y-8Z=0,求x2+y2-z2/xy+yz的值
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已知3X-4Y-Z=0,2X+Y-8Z=0,求x2+y2-z2/xy+yz的值已知3X-4Y-Z=0,2X+Y-8Z=0,求x2+y2-z2/xy+yz的值已知3X-4Y-Z=0,2X+Y-8Z=0,
已知3X-4Y-Z=0,2X+Y-8Z=0,求x2+y2-z2/xy+yz的值
已知3X-4Y-Z=0,2X+Y-8Z=0,求x2+y2-z2/xy+yz的值
已知3X-4Y-Z=0,2X+Y-8Z=0,求x2+y2-z2/xy+yz的值
24x-32y-8z=0
(24x-32y-8z)-(2x+y-8z)=22x-33y
y=2x/3;
8x+4y-32z=0
8x+4y-32z+3x-4y-z=11x-33z=0
z=x/3
x=3z
y=2z
(x2+y2-z2)/(xy+yz)=(3*3+2*2-1*1)/(3*2+2*1)=3/2
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