(1)解:(1)························ 3分 (2)······························ 5分 ··················· 6分 答:每天多做(或)件夏凉小衫才能完成任务.·········· 7分 (2)解:在Rt△AEF和Rt△DEC中,∵EF⊥CE,∴∠FEC=90°, ∴∠AEF+∠DEC=90°,而∠ECD+∠DEC=90°, ∴∠AEF=∠ECD. ································································ 1分 又∠FAE=∠EDC=90°.EF=EC ∴Rt△AEF≌Rt△DCE. ································································ 3分 AE=CD. ································································ 4分 AD=AE+4. ∵矩形ABCD的周长为32 cm,∴2(AE+AE+4)=32. ······················· 6分 解得, AE="6" (cm). ······················ 7分 |