Question

y=

x2

x+3

的導(dǎo)數(shù)是（　�。�

• A、

  x2+6x

  (x+3)2

• B、

  x2+6x

  x+3

• C、

  x2

  (x+3)2

• D、

  x2-6x

  (x+3)2

Answer 1

分析：利用導(dǎo)數(shù)的四則運(yùn)算法則，按規(guī)則認(rèn)真求導(dǎo)即可

解答：解：y′=

(x2)′(x+3)-x2(x+3)′

(x+3)2

=

2x(x+3)-x2

(x+3)2

=

x2+6x

(x+3)2

故選A

點(diǎn)評(píng)：本題考查了導(dǎo)數(shù)的除法運(yùn)算法則，解題時(shí)認(rèn)真計(jì)算即可，屬基礎(chǔ)題