如图,在四边形ABCD中,AC=4,BD=6,且AC⊥BD,顺次连接四边形ABCD各边中点,得到四边形A 1 B 1 C 1 D 1 ;再顺次连接四边形A 1 B 1 C 1 D 1 各边中点,得到四边形A 2 B 2 C 2 D 2 …如此进行下去得到四边形A n B n C n D n .则四边形A 3 B 3 C 3 D 3 的面积______,四边形A n B n C n D n 的面积______.
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举一反三
【单选题】According to the man, why are there so many unhappy adults in the world?
A.
Because they are not brighter than others.
B.
Because they don't have good education.
C.
Because they are not doing the things they are best at.