Question 2: 1

The third question? Two answers, 2x+4/3 or -2x-4?

The fourth f(2.5)=-0.5?

Fifth, when ①0≤x≤a/2, y =1/2x&; sup2

② when a/2 < x < 3a/2, y = ax/2-a&; sup2/8

③ When 3a/2 ≤ x ≤ 4a, y =-(2a-x) & sup2; /2+3a & amp； sup2/4

Question six? draw

Question 7 B={0, 1, 4}?

The element in question 8 m is 6.

Question 9 (3,-1)

Question 10 f (x) = x 2-2x+ 1