设手谨则A=(x1,y1)B=(x2,y2)根据题意,y1=1y2=x2-7A=(x1,1)B=(x2,x2-7)根据中点公晌辩式(x1+x2)/2=1(1+x2-7)/2=-1则x1=-2x2=4A=(-2,1)B=(4,-3)L斜率为-2/毕棚3