ab=-1.a+b=2,则 b/a+a/b=
问题描述:
ab=-1.a+b=2,则 b/a+a/b=
答
b/a+a/b=(b2+a2)/ab=[(a+b)2-2ab]/ab=(4+2)/-1=-6
ab=-1.a+b=2,则 b/a+a/b=
b/a+a/b=(b2+a2)/ab=[(a+b)2-2ab]/ab=(4+2)/-1=-6