what number should be next after eighty-one（39 27 81） it's__

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what number should be next after eighty-one（39 27 81） it's_____
答案是243
为什么呢?这3个数有什么规律?
对了还有道
do you think ___ of us can use a robot
every one
为什么呢？

说明是四个数字：3、9、27、81、（243）,前面一个乘以3得后面那个
everyone是一个词,只用来指人,等于everybody,在它后面不能跟介词of;
every one是两个词,既可用来指人,也可用来指物,等于each one,后面可跟介词of.

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