Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Mathematics
Mathematics
Problem
Let
u
(
x
)
u(x)
u
(
x
)
and
v
(
x
)
v(x)
v
(
x
)
be differentiable functions such that
u
(
x
)
v
(
x
)
=
7
\frac{u(x)}{v(x)} = 7
v
(
x
)
u
(
x
)
=
7
. If
u
′
(
x
)
v
′
(
x
)
=
p
\frac{u'(x)}{v'(x)} = p
v
′
(
x
)
u
′
(
x
)
=
p
and
(
u
(
x
)
v
(
x
)
)
′
=
q
\left( \frac{u(x)}{v(x)} \right)' = q
(
v
(
x
)
u
(
x
)
)
′
=
q
, then
p
+
q
p
−
q
\frac{p+q}{p-q}
p
−
q
p
+
q
has the value equal to a. 1 b. 0 c. 7 d. -7
Browse the problem library