作业帮帮我做一条英文的数学题
来源：学生作业帮 编辑：作业帮 分类：英语作业 时间：2024/05/28 03:50:27
帮我做一条英文的数学题
IN the xy-plane,line m is the reflection of line l across the x-asix.If The intersection of lines l and m is the point(r,s),which of the following must be true?
A r=0
B s=0
c r=s
D r=-s
E rs=-1
我知道答案是b,但是不知道为什么.
IN the xy-plane,line m is the reflection of line l across the x-asix.If The intersection of lines l and m is the point(r,s),which of the following must be true?
A r=0
B s=0
c r=s
D r=-s
E rs=-1
我知道答案是b,但是不知道为什么.
xy-平面上,直线m是直线l关于x轴的镜像.如果直线m和l的交点为(r,s).以下哪个是正确的?
A r=0
B s=0 -------- 正确!
c r=s
D r=-s
E rs=-1
A r=0
B s=0 -------- 正确!
c r=s
D r=-s
E rs=-1