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Problem
Problem
lim
x
→
a
−
x
−
b
−
a
−
b
(
x
2
−
a
2
)
\lim_{x \to a^-} \frac{\sqrt{x-b} - \sqrt{a-b}}{(x^2 - a^2)}
lim
x
→
a
−
(
x
2
−
a
2
)
x
−
b
−
a
−
b
,
(
a
>
b
)
(a > b)
(
a
>
b
)
is a.
1
4
a
\frac{1}{4a}
4
a
1
b.
1
a
a
−
b
\frac{1}{a\sqrt{a-b}}
a
a
−
b
1
c.
1
2
a
a
−
b
\frac{1}{2a\sqrt{a-b}}
2
a
a
−
b
1
d.
1
4
a
a
−
b
\frac{1}{4a\sqrt{a-b}}
4
a
a
−
b
1
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