2*(1/4+1/8+1/16+1/32+1/64+1/128)÷2
=(1/2+1/4+1/8+1/16+1/32+1/64)÷2
=（1-1/64）/2
=63/128
2*(1/4+1/8+1/16+1/32+1/64+1/128)÷2 求简便运算
3个回答
相关问题
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简便计算1/2+1/4+1/8+1/16+1/32+1/64+1/128
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1/2+1/4+1/8+1/16+1/32+1/64简便运算＝﹙1／2＋1／4＋1／8＋1／16＋1／32＋1／64＋1
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1+2+4+8+16+32+64+128简便算法
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简便运算：1/128+1/64+1/32+.+1/4=
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1+1?2+2?4+4?8+8?16+16?32+32 64+64 128+128 256+256 512+512 10
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[1/2]+[1/4]+[1/8]+[1/16]+[1/32]+[1/64]+[1/128]．
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已知1/128+1/128=1/64,1/64+1/64=1/32那1/2+1/4+1/8+1/16+1/32+1/12
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1/2+3/4+7/8+15/16+31/32+63/64+127/128的简便运算
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1-2/1-4/1-8/1-16/1-32/1-64/1-128/1-256/1的简便算法.急.
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1-2/1-4/1-8/1-16/1-32/1-64/1-128/1