(9/4)x^2 - k = 0
x^2=k*(4/9)
x=±(2/3)√k
∴M( (2/3)√k ,0 ) N( -(2/3)√k ,0)
∴MN=(2/3)√k - [-(2/3)√k] = (4/3)√k
又Q(0,1)
∴S△QMN=MN*高 / 2 = (4/3)√k * 1 / 2 = 2/3√k
∵k>0 ∴.(额..我也不知道怎么办了 a .)
(9/4)x^2 - k = 0
x^2=k*(4/9)
x=±(2/3)√k
∴M( (2/3)√k ,0 ) N( -(2/3)√k ,0)
∴MN=(2/3)√k - [-(2/3)√k] = (4/3)√k
又Q(0,1)
∴S△QMN=MN*高 / 2 = (4/3)√k * 1 / 2 = 2/3√k
∵k>0 ∴.(额..我也不知道怎么办了 a .)