函数f(x)=2x+a/π2(a﹥0)，在(0，+∞)内最小值为f(x0)=12，则x0=
_______termsofqualityandservice,ourcompanysurpassesthecompetition.
曲线在点（0，-1）处的切线方程为________.
Many_______willbeopenedupinthefutureforthosewithauniversityeducation．
Edisontestedmorethanonethousandmaterialstoseeiftheycould_____electric;currentandglow.
