\(=\left(1+\frac{1}{2}\right)+\left(1+\frac{1}{4}\right)+\left(1+\frac{1}{8}\right)+\left(1+\frac{1}{16}\right)+...+1+\frac{1}{1024}\)

\(=\left(1+1+1+...+1\right)+\left(1+\frac{1}{2}+\frac{1}{4}+....+\frac{1}{1024}\right)\)

\(=9+\frac{1}{512}=\frac{4609}{512}\)

=11/9+7/6*5/3

=11/9+7/6

=139/54

tự rút gọn nếu muốn nhé

k mình

=19/6 nha

HT

chúc bn năm mới vui vẻ

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Ta có: \(1\frac{4}{5}+2\frac{5}{7}+3\frac{4}{5}+4\frac{5}{7}\)

\(=\left(1\frac{4}{5}+3\frac{4}{5}\right)+\left(2\frac{5}{7}+4\frac{5}{7}\right)\)

\(=\left(\frac{9}{5}+\frac{19}{5}\right)+\left(\frac{19}{7}+\frac{33}{7}\right)\)

\(=\frac{28}{5}+\frac{52}{7}=13\frac{1}{35}\)

= ( \(1\frac{4}{5}\)+ \(3\frac{4}{5}\)) + (  \(2\frac{5}{7}\)+  \(4\frac{5}{7}\))         

=        \(4\frac{4}{5}\)           +       \(6\frac{5}{7}\)

=           \(\frac{24}{5}\)         +        \(\frac{47}{7}\)

=  ...... ( tính nốt nhé )

\(\frac{3}{2}+\frac{3}{8}+\frac{3}{32}+\frac{3}{128}+\frac{3}{512}\)

=\(\frac{3}{1.2}+\frac{3}{2.4}+\frac{3}{4.8}+\frac{3}{8.16}+\frac{3}{16.32}\)

=\(\frac{3}{1}-\frac{3}{2}+\frac{3}{2}-\frac{3}{4}+\frac{3}{4}-\frac{3}{8}+\frac{3}{8}-\frac{3}{16}+\frac{3}{16}-\frac{3}{36}\)

=\(\frac{3}{1}-\frac{3}{36}\)=\(\frac{35}{12}\)

a)=768/512+192/512+48/512+12/512+3/512

=768+192+48+12+3/512

=1023/512 

b)=405/81+135/81+45/81+15/81+5/81

=405+135+45+15+5/81

=595/81

c)=256/192+64/192+16/192+4/192+1/192

=256+64+16+4+1/192

=341/192

2/3+5/4=23/12

k minh nha

\(\frac{2}{3}\) + \(\frac{5}{4}\)

= \(\frac{2.4}{3.4}\) + \(\frac{5.3}{4.3}\)

= \(\frac{8}{12}\) + \(\frac{15}{12}\)

= \(\frac{23}{12}\)

Đáp số : \(\frac{23}{12}\)

a)  \(4\frac{3}{5}-\left(\frac{5}{2}-2\right)+\frac{5}{4}\)

\(=\frac{23}{5}-\frac{5}{2}+2+\frac{5}{4}\)

\(=\frac{107}{20}\)

b)  \(47,31-18,27-8,27+4,6\)

\(=25,37\)

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