草莓 标题 2 ∂r∂ωr(yωω)=(yωω){(logy)r+∑i=1r(−1)Ir⋯(r−i+1)(logy)riωi} \frac {\partial^r} {\partial \omega^r} \left(\frac {y^{\omega}} {\omega}\right) = \left(\frac {y^{\omega}} {\omega}\right) \left\{(\log y)^r + \sum_{i=1}^r \frac {(-1)^ Ir \cdots (r-i+1) (\log y)^{ri}} {\omega^i} \right\} ∂ωr∂r(ωyω)=(ωyω){(logy)r+i=1∑rωi(−1)Ir⋯(r−i+1)(logy)ri}Mr.mi小于 1 分钟水果草莓红小