设函数f(x)=1-x^3在区间(,)

Insomeschoolschildrenwhoprefertoreadbooksratherthan________footballbecomesocialoutcasts(被抛弃者).

已知函数f(x)满足方程f(x)f(x)2f(x)0及()()2xfxfxe,(I)求f(x)的表达式 (II)求曲线220()()dxyfxftt的拐点.

Thewealthofacountryshouldbemeasured________thehealthandhappinessofitspeopleaswellasthematerialgoodsitcanproduce.

设曲线y=ax^2+2x在点(1,a+2)处的切线与直线y=4x平行，则a=（）