Come into the room.

到房间里来。

Look into the matter.

调查此事。

The rain later turned into snow.

雨后来变成雪。

2 into 6 means 6 divided by 2.

2 into 6即6被2除之意。

x into y means x times y, or y multiplied by x.

x into y即x乘y或y被x乘之意。

be into

热衷于...；熟知。