如图,直线y=x+1与y轴交于点A1,依次作正方形A1B1C1O、正方形A2B2C2C1、

如图,直线y=x+1y轴交于点A1,依次作正方形A1B1C1O、正方形A2B2C2C1、正方形AnBnCnCn1,使得点A1A2An在直线x+1上,点C1C2Cnx轴上,则点Bn的坐标是(  )

A.(2n12n1 B.(2n1+12n1    C.(2n12n1  D.(2n1n

答案

A【考点】F8:一次函数图象上点的坐标特征;D2:规律型:点的坐标.

【分析】先求出直线y=x+1y轴的交点坐标即可得出A1的坐标,故可得出OA1的长,根据四边形A1B1C1O是正方形即可得出B1的坐标,再把B1的横坐标代入直线y=x+1即可得出A1的坐标,同理可得出B2B3的坐标,可以得到规律:Bn2n12n1),据此即可求解.;

【解答】解:∵令x=0,则y=1

A101),

OA1=1

∵四边形A1B1C1O是正方形,

A1B1=1

B111).

∵当x=1时,y=1+1=2

B232);

同理可得,B374);

B1的纵坐标是:1=20B1的横坐标是:1=211

B2的纵坐标是:2=21B2的横坐标是:3=221

B3的纵坐标是:4=22B3的横坐标是:7=231

Bn的纵坐标是:2n1,横坐标是:2n1

Bn2n12n1).

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