截距极限gydF4y2Ba

让gydF4y2Ba $f (x) = \ dfrac {(x + a) ^ {2}} {x ^ {2}}gydF4y2Ba$而且gydF4y2Ba $g (a)gydF4y2Ba$是截距gydF4y2Ba $f (x)gydF4y2Ba$在gydF4y2Ba $xgydF4y2Ba$设在。gydF4y2Ba

找到gydF4y2Ba $一个\ \ displaystyle \ lim_ {0 ^ {-}} g (a) + \ lim_ {\ 0 ^ {+}} g (a)。gydF4y2Ba$