f(x1)>f(x2)
应为f(x1)>g(x2)
f(x)=x^2-ax-10
=x^2-ax+(a/2)^2-(a/2)^2-10
=(x-a/2)^2-a^2/4-10
f(x)最小值为-a^2/4-10
g(x)=-9x^2最大值为0
-a^2/4-10>0
a^2
f(x1)>f(x2)
应为f(x1)>g(x2)
f(x)=x^2-ax-10
=x^2-ax+(a/2)^2-(a/2)^2-10
=(x-a/2)^2-a^2/4-10
f(x)最小值为-a^2/4-10
g(x)=-9x^2最大值为0
-a^2/4-10>0
a^2