1.从左向右作射线AC,
2.在射线AC上以A为端点,向右截取AD=a,
3.在射线DC上,以D为端点向右截取DE=b,
4,在线段AE上,以E为端点,向左截取DB=c
5,则AB=a +b -c
A_______B____D_____________E_____________________________C______
已知：线段a,b,c 求作：线段AB,使AB=a+b-c ___________a ___________b _____
1.从左向右作射线AC,
2.在射线AC上以A为端点,向右截取AD=a,
3.在射线DC上,以D为端点向右截取DE=b,
4,在线段AE上,以E为端点,向左截取DB=c
5,则AB=a +b -c
A_______B____D_____________E_____________________________C______