Question

tính nhanh

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

nhanh nha 

giải đầy đủ mk tk cho

Answer 1

1/128+2/128+4/128+8/128+16/128+32/128+64/128=127/128

 k di

Answer 2

óc chó

Answer 3

\(\frac{1}{4}+\frac{1}{8}+\frac{1}{16}+\frac{1}{32}+\frac{1}{64}+\frac{1}{128}\)đề là như vậy mới đúng

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

=\(1-\frac{1}{128}=\frac{127}{128}\)

Answer 4

= \(\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{8}+\frac{1}{8}-\frac{1}{16}+....+\frac{1}{64}-\frac{1}{128}\)

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

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