(1) 1/x-1/y=3,分式(2x+3xy-2y)/(x-2xy-y)=_______(2) 2的n次方+2的-n次方=k,则4的n次方+4的-n次方=______(3) 若(2m-n)/n=1/3,则m/n=_______(4) 1/m+1/n=1/(m+n),则n/m+m/n=_______(5) x方-5x+1=0,则x的四次方+x的四次方分之一=______(6
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