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=0B s=0c r=sD r=-sE rs=-1我知道答案是b,但是不
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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=0B s=0c r=sD r=-sE rs=-1我知道答案是b,但是不
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