—_______ nice day today! —Yeah, let's take a walk outside.
A:What a
B:What
C:How
将含45°角的三角板的直角顶点R放在直线l上,分别过两锐角的顶点M,N作l的垂线,垂足分别为P、Q,
已知函数y=(m﹣1)x+m2﹣1是正比例函数,则m=____
45−x=27
x= ____