,第六章反比例函数,北师版,专题练习六反比例函数的综合运用,A,B,k,1,B,2,D,14,(,百色中考,),如图,,,ABC,的顶点坐标分别为,A(,2,,,3),,,B(,3,,,1),,,C(,1,,,2),,,以坐标原点,O,为旋转中心,,,顺时针旋转,90,,,得到,ABC,,,B,,,C,分别是点,B,,,C,的对应点,(1),求图象过点,B,的反比例函数表达式;,(2),求线段,CC,的长,(,3,),如图,,,延长,A,C,交,x,轴于,D,,,由平移可得,,,A,P,AO,,,又,A,C,y,轴,,,P,(,2,,,4,),,,点,A,的纵坐标为,4,,,即,A,D,4,,,如图,,,过,B,作,B,E,y,轴于,E,,,PB,y,轴,,,P,(,2,,,4,),,,点,B,的横坐标为,2,,,即,B,E,2,,,又,AOB,A,PB,,,线段,AB,扫过的面积平行四边形,POBB,的面积平行四边形,AOPA,的面积,BO,B,E,AO,A,D,3,2,4,4,22,