留学知识库
小学数学 1/7=1/A 1/B=1/C-1/D 求A B C D=?
The doctor came in hurriedly with _____ look.
All the staff present saw a cloud of dust rose up,____ by an explosion.
The villager said fearfully that his land _____would be flooded by ____.
It’s suggested that some experts be ____from colleges to industry,
Now these athletes ____that their success is due to very hard training.
设一个凸n变形的内角成等差数列，若最小角是100度，最大角是140度，求边数n
等差数列中，前m项和是m/n，前n项和是n/m,m不等于n，则前m n项的和是
