Find a master to solve math problems in senior three. - Training Enrollment Network

Find a master to solve math problems in senior three.

9) solution: ∵ f ′ (x) > f (x)

∴(e-xf(x))'=- e-xf(x)+e-xf'(x)

= e-x(f′(x)-f(x))& gt； 0

∴e-xf(x) is adding functions.

∫a > 0

∴e-af(a) >f(0)

∴ f (a) > EAF (0) Select B.

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