\(70.\left(\frac{252525}{565656}+\frac{252525}{727272}+\frac{252525}{909090}\right)\)

\(=70.\left(\frac{25}{56}+\frac{25}{72}+\frac{25}{90}\right)\)

\(=70.25.\left(\frac{1}{7.8}+\frac{1}{8.9}+\frac{1}{9.10}\right)\)

\(=1750.\left(\frac{1}{7}-\frac{1}{8}+\frac{1}{8}-\frac{1}{9}+\frac{1}{9}-\frac{1}{10}\right)\)

\(=1750.\left(\frac{1}{7}-\frac{1}{10}\right)\)

\(=1750.\frac{3}{70}\)

\(=75\)

Tính : 

\(=70.\left(\frac{25}{56}+\frac{25}{72}+\frac{25}{90}\right)\)

=\(70.\frac{15}{14}\)

=75 

knha

27 x \(\left(\frac{171717}{272727}+\frac{373737}{363636}\right)\)

= 27 x \(\left(\frac{17}{27}+\frac{37}{36}\right)\)

= 27 x \(\frac{17}{27}\)+  27 x \(\frac{37}{36}\)

= 17 + 27,75

= 44,75

\(\frac{178}{4}\)bạn nhé

\(27\times\left(\frac{171717}{272727}+\frac{373737}{363636}\right)\)

\(=27\times\left(\frac{17}{27}+\frac{37}{36}\right)\)

\(=27\times\frac{17}{27}+27\times\frac{37}{36}\)

\(=17+\frac{111}{4}\)

\(=\frac{179}{4}\)

> Chúc bạn học tốt <

151515/363636 = 15. 10101 / 36 . 10101 = 15 / 36 = 5/12

135135135 / 162162162 = 135 . 1001001 / 162 . 1001001 = 135 / 162 = 5/6

151515/363636 = 5/12

135135135/162162162 = 5/6

151515 / 363636 = 5 / 12

135135135 / 162162162 = 5 / 6

mình ko viết được phân số thông cảm

\(\frac{121212+12121212-1212}{363636-36363636-3636}=\frac{12\left(111111+11111111-1111\right)}{36\left(111111+11111111-1111\right)}=\frac{12}{36}=\frac{1}{3}\)

1/3 nha

\(\frac{1}{3}\)

chúc ban hk tốt!!(k cho tui nhé)

\(\frac{252525}{373737}=\frac{252525:10101}{373737:10101}=\frac{25}{37}\)

\(\frac{272727}{353535}=\frac{272727:10101}{353535:10101}=\frac{27}{35}>\frac{27}{37}>\frac{25}{37}\)

vậy \(\frac{252525}{373737}

\(\frac{252525}{373737}=\frac{25.10101}{37.10101}=\frac{25}{37}=\frac{875}{1295}\)

\(\frac{272727}{353535}=\frac{27.10101}{35.10101}=\frac{27}{35}=\frac{999}{1295}\)

Vì \(\frac{875}{1295}

\(\frac{252525}{373737}=\frac{252525:10101}{373737:10101}=\frac{25}{37};\frac{272727}{353535}=\frac{272727:10101}{353535:10101}=\frac{27}{35}\)

=>25/37<27/35

= 1/3 nha bạn 

ai k mình k lại

1/3 nha ban ghet con trai nen cu cho co gai nha 

rút gọn phân số :

121212/363636 = 3

121212/363636 

rút gọn nhanh nhất là :

121212 : 121212 = 1

363636 : 121212 = 3

Vậy phân số tối giản là 1/3

121212/363636 = 12/36 = 4/9

Ai làm nhanh nhất được tích nha bạn

Ta có: \(\frac{121212}{363636}=\frac{121212\div121212}{363636\div121212}=\frac{1}{3}\)