“眼睛是心灵的窗户,拥有明亮的双眸才能看见更远的未来,所以护眼、爱眼,让我们用双眼在迷茫中寻找寻一丝丝光明”,如图为眼球结构示意图.请据图分析填空:
已知{an}为等差数列,其公差为-2,且a7是a3与a9的等比中项,sn为{an}的前n项和,n∈N﹡,则S10的值为( )
Surely it doesn't matter where charities get their money from, but what ____ is what they do with it.
向量 (AB→+MB→)+(BO→+BC→)+OM→ 化简后等于( )