1..设x/a+y/b+z/c=1,a/x+b/y+c/z=0,求x*2/a*2+y*2/b*2+z*2/c*2的值．2..设是x,y,z有理数,且(y-z)*2+(z-x)*2+(x-y)*2=(y+z-2x)*2+(2+x-2y)*2+(x+-2z)*2,求(yz+1)(zx+1)(xy-1)/(x*2+1)(y*2+1)(z*2+1)的值.3..设x+y+z=3a(a≠0)求(x-a)(y-a)+(y-a)(x-a)+(z

Question

1..设x/a+y/b+z/c=1,a/x+b/y+c/z=0,求x*2/a*2+y*2/b*2+z*2/c*2的值．
2..设是x,y,z有理数,且(y-z)*2+(z-x)*2+(x-y)*2=(y+z-2x)*2+(2+x-2y)*2+(x+-2z)*2,求(yz+1)(zx+1)(xy-1)/(x*2+1)(y*2+1)(z*2+1)的值.
3..设x+y+z=3a(a≠0)求(x-a)(y-a)+(y-a)(x-a)+(z-a)(x-a)/(x-a)*2+(y-a)*2+(z-a)*2的值
4..已知a+b+c=0,求a*2/2a*2+bc(从这段开)+b*2/2b*2+ac(段开)+c*2/2c*2+ab的值
5.已知x=abc/ab+bc+ca=a+b+c,求证(x-a)(x-b)(x-c)=0
另;能做几道做几道,明天要用,回答的越多分越多.

Answer 1

这是奥舒体,好久没做了,都忘了