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折线图2-绘制三角形曲线

Autor:i景然
研磨自：【GGB教学】（指令）折线图2-绘制三角形曲线_哔哩哔哩_bilibili
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https://www.bilibili.com/video/BV1aB4y1x7NZ/?spm_id_from=333.788.recommend_more_video.3&vd_source=edcad05029f6d4b15eaba8a422397416
l1={A,B,C,A} l2=x(l1) l3=y(l1) f(x)=折线图(0...3,l2) g(x)=折线图(0...3,l2) a=曲线=(f(t),g(t),t,0,3) b=滑动条(0,3,0.01) 赋值(b,0) eq1:x=b D=交点(eq1,f) #D=(b,f(b)) E=交点(eq1,g) #E=(b,g(b)) F=a(b) #F=(f(b),g(b)) #启动动画b,明显不匀速，线段长时快，线段短时慢，每段用时一样

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