◆[help!做一道数学题...◆若多项式x（的平方）-8x-1和3x(的平方)+4x-n的常数项相同,则2n-2n分之1=多少?是3/2吗?为什麽?

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• ●[Help!●对于方程组4分之x+y加5分之x-y等于3,与4分之x+y减5分之x-y等于-1,不妨设4分之x+y等于u,5分之x-y等于=v（方程组）,则原方程组变成以u,v为未知数的方程组是_________,__________,（方程组）,解得u=_________,v=________,（方程组）,从而求得原方程的解是x=_______,y=________,（方程组）,这种解法称之为换元法.
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