Things sort of cancel out here. Rearrange 4x squared divided by n squared minus x squared.

有些量抵消了,整理一下4x平方除以n平方减x平方。

youdao

Things sort of cancel out here. Rearrange 4x squared divided by n squared minus x squared.

有些量抵消了,整理一下4x平方除以n平方减x平方。

youdao