用适当的疑问词填空.-___did you play the piano when you were 10 years old?-Every day.

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• 用适当的疑问词填空.-___did you play the piano when you were 10 years old?-Every day.
• 如图,三角形ABC中,角B=90度,AB=6cm,BC=8cm,点P从点A开始沿AB边向点B以1cm/s的速度运动,点Q从点B开始沿BC向C以2cm/s的速度运动.（1）P Q分别从A  B同时出发,经过几秒钟,使S三角形PBQ=8平方厘米  (2)P Q分别从A  B同时出发,并且P到B后又继续在BC边上前进,Q到C后又继续在CA边上前进,经过几秒钟,使S三角形PBQ=12.6平方厘米
• 如图,在Rt△ABC中,∠C=90°,AC=6cm,BC=8cm.点P,Q同时由A,B两点出发,分别沿AC,BC方向都以1cm/s的速度匀速移动,那么运动到多少秒时,△PCQ的面积是12cm²?