Discussion on the classification of the second question of mathematics in Dalian senior high school entrance examination 20 1 1, how to find it when the overlapping shape is quadrilateral
A'(2t，2) B'( 1+2t，0)
A'B' equation, y=-2x+2+4t
AC equation: y=-x/2+2.
Let A'B' and AC intersect at m.
Then m (8t/3,2-4t/3)
When 3/2
When 0
=-5t？ / 12+5/2