挑战习题
1/5单选题
难度:

1.

若P是线段AB的黄金分割点(PA>PB),AB=2,则PA的长约为(    )


A

0.382

B

0.764

C

1

D

1.236

提示1:
PHA+5qC55o2u6buE6YeR5q+U55qE5YC855u05o6l5rGC6Kej5Y2z5Y+vPC9wPg==
正确答案:RA==
PGRpdj7moLnmja7pu4Tph5Hmr5TnmoTlgLzlvpfvvJpQQeKJiEFCw5cwLjYxOD0xLjIzNi48YnI+5pWF6YCJRC48L2Rpdj4=