1.若a/b=b/c=c/d=d/a,求(a-b+c-d)/(a+b-c+d)的值.2.已知:xy-x-y-4=0.求(xy-1)^2-2x^2y-2xy^2+x^2+y^2+6xy-2x-2y的值.3.设a、b、c是三个互不相等的正数,如果(a-c)/b=c/(a+b)=b/a,那么( )A.3b=2c B.3a=2b C.2b=c D.2a=b
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