When discussing by classification, 1, t0.5, draw a picture, and pay attention to the intercept of the Y axis. The first quadrant is a right triangle, and the intercept can be represented by t, and |op| can also be represented by t. The area can be found and the numbers are all complementary. (area is a function of t) 2. When t is t0.5, the area of the second quadrant can be obtained by the same method, and then subtracted from the rectangular area. . 3, t=0.5 At this time, Q is on the Y axis, which is easy to calculate.