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已知线段a,b(a<2b)画一条线段AB,使AB等于 (1)a-b(2)2b-a
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(1)作一直线,在直线上取点OA,使OA=a
(2)以点O为起点,在直线上取点B(与OA同向),使OB=b
则AB=OA-OB=a-b
(1)作一直线,在直线上取点ON,使ON=b
(2)以N为起点,与ON同向作NA=b,则有OA=2b
(3)以O为起点,在直线上取点B,OB与ON同向,使OB=a
则AB=OA-OB=2b-a
(2)以点O为起点,在直线上取点B(与OA同向),使OB=b
则AB=OA-OB=a-b
(1)作一直线,在直线上取点ON,使ON=b
(2)以N为起点,与ON同向作NA=b,则有OA=2b
(3)以O为起点,在直线上取点B,OB与ON同向,使OB=a
则AB=OA-OB=2b-a
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