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是一直加到7個2還是無窮下去.這個可以用按位數來乘比如你一直是加到7個2的就這樣按比特乘:2*1+2*2+2*3+2*4+2*5+2*6+2*7如此類推2222222*******1234567=======2469134看懂了沒?
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