简介: x 2 1 x 3 12 0.5 24 12 3 75 15 2 1 1 2 1 1 2 a 3 a2 9 1 a 3 a a 3 3 a 3 a 3 a 3 a a 3 a 3 a 3 a 1 a 3 5 10% 50 80 x 90 70 x 80 50 2 5 16 13 14 7 13 400 160 50 k y x 0 A 2,4 x k x 2 4 2 {#{QQABQYKEog...