###???
by wzx20061006 @ 2017-08-16 21:28:10
~~???~~
@子谦
by wuyutong111 @ 2018-09-09 11:03:48
这位大佬的意思应该是整点的意思吧
by wqqe223 @ 2020-03-06 23:38:04
假如x1=x2或y1=y2是不是就不是一次函数了
by Etic_HAO @ 2022-12-13 22:06:10