若实数x,y,z满足3x+7y+z=1,4x+10y+z=2005,求分式x+3y/2004x+2004y+2004z的值.
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若实数x,y,z满足3x+7y+z=1,4x+10y+z=2005,求分式x+3y/2004x+2004y+2004z的值.若实数x,y,z满足3x+7y+z=1,4x+10y+z=2005,求分式x
若实数x,y,z满足3x+7y+z=1,4x+10y+z=2005,求分式x+3y/2004x+2004y+2004z的值.
若实数x,y,z满足3x+7y+z=1,4x+10y+z=2005,求分式x+3y/2004x+2004y+2004z的值.
若实数x,y,z满足3x+7y+z=1,4x+10y+z=2005,求分式x+3y/2004x+2004y+2004z的值.
用4x+10y+z=2005减去3x+7y+z=1
得x+3y=2004
用3x+7y+z=1乘以3得9x+21y+3z=3-----P
用4x+10y+z=2005乘以2得8x+20y+2z=4010-----Q
用方程p减去方程q得x+y+z=-4007
所以所求式子为2004/2004*-4007=-1/4007
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