Studentsenrolledasfull-timecanfully____intheuniversityextracurricularclubs.
已知(x2+6x+9)+6(x+3)+9=0,那么x=?
x,y,z是三个正整数，已知3x=4y=7z,那么x+y+z的最小值是多少?
已知函数11sinxfxxx，记0limxafx，(I)求a的值 (II)若x0时，fxa与kx是同阶无穷小，求常数k的值.
Hiswifehasbeen_______alotofpressureonhimtochangehisjob.
