题目

如图，正方形ABCD和正方形ECGF.（1）写出表示阴影部分面积的代数式.（2）求cm，cm时，阴影部分的面积. 答案：解析:p;【解析】略--- Lily is ill in hospital .---Really ? I _____ know she was ill .A.don’t know B.know C. knew D.didn’t know