挑战习题
1/5单选题
难度:

1.

如图,已知Rt△ABC,∠B=90°,AB=8cm,BC=6cm,点P从A点出发,以1cm/秒的速度沿AB向B点匀速运动,点Q从A点出发,以xcm/秒的速度沿AC向C点匀速运动,且P、Q两点同时从A点出发,设运动时间为t秒,连接PQ,当P点运动到AB的中点时,若恰好PQ∥BC,则此时x的值为( )

青果学院


A

B

2

C

D

提示1:
PHA+UFHiiKVCQ++8jFDmmK9BQueahOS4reeCue+8jOWImVHkuIDlrprmmK9BQ+eahOS4reeCue+8jOaxguW+l0FR55qE6ZW/77yM5YiZ6YCf5bqmeOWNs+WPr+axguW+l++8mzwvcD4=
正确答案:RA==
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