(2)∫S = 1/2×(8-x)×6

∴S= 1/2×(8-5)×6

S=9

(3) No, when: △OPA area is equal to 24, Y is equal to 8.

And x=0.

When the △OPA area is greater than 24, ∴ Y is greater than 8.

And x < 0.

X cannot be a negative number.

∴ cannot be greater than 24.

120 10 problem

parallel

1211/problem

( 1) 1、2、3

(2)2、3、4

(3) 1、2、3

(4) 1、2、4