3+6+12+24+48+96+192
=3*1+3*2+3*4+3*8+3*16+3*32+3*64
=3*(1+2+4+8+16+32+64)
=3*1(1-2^6)/(1-2)
=3*127
=381
3+6+12+24+48+96+192的简便计算
3个回答
相关问题
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（1/3+1/6+1/12+1/24+1/48+1/96+1/192+1/384）*128,简便计算,
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计算 2/3+1/6+1/12+1/24+1/48+1/96+1/192
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5/6+11/12+23/24+47/48/+95/96+191/192等于多少 要简便过程 急!
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5/6+11/12+23/24+47/48/+95/96+191/192等于多少
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1/3+1/6+1/12+1/24+1/48+1/96的简便方法.
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11/12+23/24+47/48+95/96+191/192+383/384
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3+6+12+24+.+192=按规律计算
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简便计算 204^+204x192+96^
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5/6+11/12+23/24+47/48/+95/96+191/192+383/384+767/768+1535/15