= 119 

tk mk nha bn 

thanks @@@@@@@@@@@@@@@@

119 ( k mik đi ạ )

69x57 =3933

28+11=39

26+19=45

39+6=45

3933

33

45

45

B

B

on

from - from

between

on

from-from

between

chịch

quên cách làm rồi

a: \(-\frac{10}{3}+\frac{13}{10}-\frac16+\frac{7}{10}\)

\(=\left(-\frac{10}{3}-\frac16\right)+\left(\frac{13}{10}+\frac{7}{10}\right)\)

\(=-\frac{21}{6}+\frac{20}{10}=-\frac72+2=-\frac32\)

b: \(1-\frac{20}{6}+\frac{39}{30}-\frac{4}{24}+\frac{34}{50}\)

\(=1-\frac{20}{6}+\frac16+1,3+0,68\)

\(=1-\frac{19}{6}+1,98=2,98-\frac{19}{6}=\frac{298}{100}-\frac{19}{6}=\frac{-56}{300}=\frac{-14}{75}\)

c: \(\frac{15}{24}-\frac{6}{26}+\frac{28}{48}-\frac{30}{39}+\frac{10}{24}\)

\(=\left(\frac{15}{24}+\frac{10}{24}+\frac{28}{48}\right)-\left(\frac{3}{13}+\frac{10}{13}\right)\)

\(=\left(\frac{25}{24}+\frac{14}{24}\right)-1=\frac{39}{24}-1=\frac{15}{24}=\frac58\)

d: \(-\frac{5}{10}+\frac{12}{28}-\frac{3}{27}-\frac{7}{18}+\frac{20}{35}\)

\(=-\frac12+\frac37-\frac19-\frac{7}{18}+\frac47\)

\(=\left(-\frac12-\frac19-\frac{7}{18}\right)+\left(\frac37+\frac47\right)=-1+1=0\)

Câu hỏi là gì zậy

39* 1200 = 3931200

a = 8

26/39 = 2/3

30/42=5/7

38/57=2/3

51/85=3/5

39/65=3/5

20/28=5/7

=> 39/65=51/85

=> 20/28=30/42

=> 26/39=38/57

k nhé

ghép cặp vào ra 28 nha

Bằng 28.

Vậy mà cũng ko biết