Xx11/5-Xx4/7=5/77

Xx(11/5-4/7)=5/77

Xx57/35=5/77

x=5/77:57/35=25/627

(2,468-1,057)x0,72=

a) \(\frac{3}{5}+\frac{6}{11}+\frac{7}{13}+\frac{5}{11}+\frac{2}{5}+\frac{19}{13}=\left(\frac{3}{5}+\frac{2}{5}\right)+\left(\frac{6}{11}+\frac{5}{11}\right)+\left(\frac{7}{13}+\frac{19}{13}\right)=1+1+2=4\)

b) \(\frac{6}{5}\times\frac{3}{8}+\frac{5}{8}\times\frac{6}{5}-\frac{4}{5}=\frac{6}{5}\times\left(\frac{3}{8}+\frac{5}{8}\right)-\frac{4}{5}=\frac{6}{5}-\frac{4}{5}=\frac{2}{5}\)

c) \(\frac{4\times5\times6\times7\times8}{8\times10\times12\times14\times16}=\frac{1}{2\times2\times2\times2\times2}=\frac{1}{32}\)

a, \(\frac{3}{5}+\frac{6}{11}+\frac{7}{13}+\frac{6}{11}+\frac{2}{5}+\frac{19}{13}\)

\(=\left(\frac{3}{5}+\frac{2}{5}\right)+\left(\frac{7}{13}+\frac{19}{13}\right)+\left(\frac{6}{11}+\frac{6}{11}\right)\)

\(=1+2+\frac{12}{11}\)

\(=3+\frac{12}{11}\)

\(=\frac{45}{11}\)

a) x−5/7-13/14 =1                                                                                                         

   x                 =5/7+13/14

    x                 =23/14

=>1=14/14

    x                  =14/14+23/14

    x                  =37/14

  b) 3/5 +x+1 1/5 =11/3 

   Chuyển 1 1/5=6/5

              x=11/3-6/5-3/5

              x=28/15  

a) \(\left(x+\frac{3}{4}\right):5=\frac{5}{6}\)

\(x+\frac{3}{4}=\frac{5}{6}\text{x}5\)

\(x+\frac{3}{4}=\frac{25}{6}\)

\(x=\frac{25}{6}-\frac{3}{4}\)

\(x=\frac{41}{12}\)

b) \(\left(\frac{4}{3}+x\right)\text{x}\frac{1}{11}=\frac{7}{11}\)

\(\frac{4}{3}+x=\frac{7}{11}:\frac{1}{11}\)

\(\frac{4}{3}+x=7\)

\(x=7-\frac{4}{3}\)

\(x=\frac{17}{3}\)

a) \(x+\frac{3}{4}\div5=\frac{5}{6}\)

\(x+\frac{3}{4}=\frac{5}{6}\times5\)

\(x+\frac{3}{4}=\frac{25}{6}\)

\(x=\frac{25}{6}-\frac{3}{4}\)

\(x=\frac{41}{21}\)

b) \(\left(\frac{4}{3}+x\right)\times\frac{1}{11}=\frac{7}{11}\)

\(\frac{4}{3}+x=\frac{7}{11}\div\frac{1}{11}\)

\(\frac{4}{3}+x=7\)

\(x=7-\frac{4}{3}\)

\(x=\frac{17}{3}\)

minh ko biet nua moi lop 4 thoi

a, 48

b,4/3

 nếu đúng thì k cho mk nha

a, 48

b,4/3

đúng 100% tại vì mình lớp 5 mà