作业帮1/8+1/16+1/32+1/64+1/128简算
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1/8+1/16+1/32+1/64+1/128简算
1/8+1/16+1/32+1/64+1/128
简算
1/8+1/16+1/32+1/64+1/128简算
令a=1/8+1/16+1/32+1/64+1/128
2a=1/4+1/8+1/16+1/32+1/64+1/64
相减
a=1/4-1/128=31/128
所以1/8+1/16+1/32+1/64+1/128=31/128
先约分、约到分母是八后再计算、
8/1+16/1+32/1+64/1+128/1
1/8-1/16-1/32-1/64-1/128
1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256
1/2-1/4-1/8-16/1-32/1-64/1-128/1-256/1
1/2-1/4-1/8-1/16-1/32-1/64-1/128-1/256
1/2+1/4+1/8+1/16+1/32+1/64+1/128+.+1/1024
1-2/1-4/1-8/1-16/1-32/1-64/1-128/1
1/2-1/4-1/-1/8-1/16-1/32-1/64----------1/1024
1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256
简便计算1/2+1/4+1/8+1/16+1/32+1/64+1/128
1-1/2-1/4-1/8-1/16-1/32-1/64
简算:1/2+1/4+1/8+1/16+1/32+1/64+1/128
1/2+1/4+1/8+1/16+1/32+1/64+1/128
1+1/2+1/4+1/8+1/16+1/32+1/64
2/1+4/1+8/1+16/1+32/1+64/1+128/1=?
1/2+1/4+1/8+1/16+32/1+1/128没有1/64简算
1-1/2-1/4-1/8-1/16-1/32-1/64简便计算
1/2+1/4+1/8+1/16+1/32+1/64+1/128 简便运算