19/10=1.9

14/28 : 7/18 x 6/5 + 3/10

= 9/7 x 6/5 + 3/10

= 54/35 + 3 / 10

=108/70 + 21/70

= 129/70

Tk mk nha

=4/3x6/5+3/10

=8/5+3/10

=19/10

19/10

\(\frac{14}{27}:\frac{7}{18}\cdot\frac{6}{5}+\frac{3}{10}\)

\(=\frac{4}{3}\cdot\frac{6}{5}+\frac{3}{10}\)

\(=\frac{8}{5}+\frac{3}{10}\)

\(=\frac{19}{10}\)

. là nhân nha

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

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

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

a) 2^7 . 9^3 / 6^5 . 8^2

= 2^7 . 3^9 / 2^5 . 3^5 . 2^6

= 2^-4 . 3^4

Câu b:

B = 6^10.27^5/(4^5.81^6)

B = 2^10.3^10.3^15/(2^10.3^24)

B = 3^10.3^15/3^24

B = 3^25/3^24

B = 3

= 4/3 x 6/5 + 3/10

= 8/5 +3/10

= 19/10

cám ơn nha

43/30

138/35

104/35

62/45

mk nha

thanks

bạn viet ro phep tinh rra ho minh