A=1/2+1/4+1/8.....+1/256+1/512
2A=1+1/2+1/4+1/8...1/256
A=(1+1/2+1/4+1/8...1/256)-(1/2+1/4+1/8.....+1/256+1/512)
A=1-1/512
A=511/512
511/512
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Tìm x biết
x*(1/2+1/4+1/8+...+1/512)=511/256
A= 1/2 + 1/4 + 1/8 +...+1/256 +1/512
1/2+1/4+1/8+1/16+...+1/256+1/512
1/2 + 1/4 + 1/8 + 1/16 +...+ 1/256 + 1/512
1/2+1/4+1/8+1/16+........+1/256+1/512
Tính tổng S = 1/2+1/4+1/8+.......+1/256+1/512
1+2+4+8+.......+256+512 = ?
1/2+1/4+1/8+1/16+......+/256+1/512
1/2+1/4+1/8+1/16+......+1/256+1/512
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