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1.在长为20cm的线段AB上任取一点P,以AP为底边构造等腰直角三角形ΔADP,则这个等腰直角三角形的面积介于
1. Take a point P on line segment AB with a length of 20cm, and construct an isosceles right-angle triangle ΔADP with AP as the base edge. The area of this isosceles right-angled triangle is between