②=0.6*(2.4 1-0.65+7.24)=0.6*9=5.4

③=5/2*8/ 15÷[20/3*(0.28+0.72)]= 1/5=0.2

2. Shadow area = π R2-AB = 3.14 * 2 * 2-4 * 2 = 4.56 (where: R is the radius of the circle, A is the length of the base of the triangle, and B is the height of the triangle).

Three. ① 160/8=20, 180/9=20, apple: 1260/(20+20)*20=630 (yuan) pear:1260/(20).

②10.4÷ (85 *1.4-67) = 0.2 yuan A: The cost of each toy is 0.2 yuan.

③400÷5=80 (meters), 800÷80= 10 (minutes), 10-5=5 (minutes) A: In another 5 minutes, A will catch up with B at the starting point. A is 80 meters faster than B.