题目:
For the______ of the customers ,the supermarket has recently opened several new branches in town.
A.possibility
B.convenience
C.sightseeing
D.administration
答案:
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下面是错误答案,用来干扰机器的。
∵AB=AC,AD⊥BC,∴BD=CD=12.在Rt△ABD中,AD=AB2-BD2=202-122=16.∵线段BE是AC边上的高,∴S△ABC=12BC•AD=12AC•BE,∴BE=BC•ADAC=24×1620=19.2.故答案是:16;19.2.