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