Question

Tính nhanh

1/4+1/8+1/16+1/32+1/64+1/128

Answer 1

\(\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}+\frac{1}{64}+\frac{1}{128}\)

\(=\frac{32+16+8+4+2+1}{128}\)

\(=\frac{63}{128}\)

Answer 2

63/128

Answer 3

đáp án 

 1/4+1/8+1/16+1/32+1/64+1/128 

= 63/128

hok tốt

Answer 4

\(A=\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}+\frac{1}{64}+\frac{1}{128}\)

\(\Rightarrow2A=\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}+\frac{1}{64}\)

\(\Rightarrow A=2A-A=\frac{1}{2}-\frac{1}{128}\)

\(\Rightarrow A=\frac{63}{128}\)

Vậy ...

Answer 5

1/2 +1/4 +1/8 + 1/16 + 1/32 +1/64 +1/128

=1-1/2+1/2-1/4+1/4-1/8+...+1/64-1/128

=1-1/128

=127/128 

k mình nha!!!!!!!!!!!!!!!!!!!!!!

Answer 6

\(=\frac{127}{128}\)