已知a+b=5/2,ab=1化简(a-2)/(b-2)RT,速答

已知a+b=5/2,ab=1化简(a-2)/(b-2)RT,速答
已知a+b=5/2,ab=1化简(a-2)/(b-2)
RT,速答

已知a+b=5/2,ab=1化简(a-2)/(b-2)RT,速答
应该是乘以吧
(a-2)(b-2)
=ab-2(a+b)+4
=1-5+4
=0

(a-2)/(b-2)
=[(a-2)(b-2)]/(b-2)^2
=(ab-2a-2b+4)/(b-2)^2
=[ab-2(a+b)+4]/(b-2)^2
=(1-2×2.5+4)/(b-2)^2
=0/(b-2)^2
=0