3.
1 / 3 MATHMEDIC .
100927 ( ) # 4606
,
?
f(x) = ln(e − 1)x g(x) a f′(a)+
1
g′(a) 1
1 2 2 4 3 6 4 8 5 10
2
130626 # 1149
.
.
,
. .
f(x)
y= f(x) (2, 1) 1 f(2x)
g(x) y= g(x) (1, a)
b 10(a + b)
140927 # 1270
.
f(x) = ln(tan x) 0 < x <( π )2 g(x)
h→0lim h 4g(8h) − π
4
161121 # 1474
.
, ?
0 < t < 41 t y= x + 2x − 15x + 53 2
y= t x
(f(t), t), x (g(t), t)
h(t) = t × {f(t) − g(t)} h′(5)
1 12
79 2
12
85 3
12 91
4 12
97 5
12 103
170926 # 2199
,
.
. ( , .)
f(x) = 2x + sin x g(x) y= g(x) (4π, 2π)
p
q p+ q p q
6
171106 # 1639
f(x) = x + x + 13 g(x) , g′(1) ?
1 3
1 2
5
2 3
3
2 4
5
4 5 1
181111 # 2274
.
.
, ?
f(x), g(x) f(x) g(x) f(1) = 2, f (1) = 3′ h(x) = xg(x)
h′(2)
1 1 2
3
4 3
3
5 4 2 5
3 7
8
180911 # 1614
,
?
f(x) = x + 5x + 33 g(x) g′(3)
1 7
1 2
6
1 3
5
1 4
4
1 5
3 1
3 / 3 MATHMEDIC .
191109 # 8541
,
?
f(x) =
1 + e−x
1 g(x) g′(f(−1))
1 (1 + e)2
1 2
1 + e
e 3 (
1 + e )e 2
4 1 + e e2
5 e
(1 + e)2
10
190906 # 8275
. ,
?
x≥ e
1 f(x) = 3x ln x (e, 3e)
f(x) g(x)
h→0lim
h
g(3e + h) − g(3e − h)
1 3
1 2
2
1 3
3
2 4
6
5 5 1
190625 # 6514
,
. .
f(x) = 3e + x + sin x5x g(x) y= g(x) (3, 0)
x→3lim
g(x) − g(3) x− 3
1 . 2 . 15 3 . 16 4 . 5 . 4
6 . 7 . 8 . 9 . 10 .
11 . 17