Giúp mình nhanh nha

a: \(\frac79-\frac{4}{15}+\frac61\)

\(=\frac{35}{45}-\frac{12}{45}+6\)

\(=6+\frac{23}{45}=\frac{270}{45}+\frac{23}{45}=\frac{293}{45}\)

b: \(\frac{44}{21}-\left(\frac34+\frac{2}{21}\right)\)

\(=\frac{44}{21}-\frac{2}{21}-\frac34\)

\(=2-\frac34=\frac54\)

c: \(\frac{17}{12}+\frac{13}{7}-\frac67+\frac{7}{12}\)

\(=\frac{17}{12}+\frac{7}{12}+\left(\frac{13}{7}-\frac67\right)\)

=2+1

=3

a) 1+5+11+13+4+9

=(1+5+4)+(11+9)+13

=10         +   20   +13

=             30        +13

=                       43.

ghép những số cộng lại mà tròn chục là được

a)<=>2/7:(13/24+5/24)   b)<=>15/24-9/24-4/24       c)=7.5.39/13.14.15

<=>2/7:3/4                        <=>2/24=1/12                      =3/2.3

<=>2/7x4/3                                                                    =1/2

<=>8/21                                     

a. \(\frac{2}{7}:\frac{13}{24}+\frac{2}{7}:\frac{5}{24}\)

= \(\frac{2}{7}:\left(\frac{13}{24}+\frac{5}{24}\right)\)

= \(\frac{2}{7}:\frac{3}{4}\)

= \(\frac{8}{21}\)

b. \(\frac{15}{24}-\frac{3}{8}-\frac{1}{6}\)

= \(\frac{15}{24}-\frac{9}{24}-\frac{4}{24}\)

= \(\frac{2}{24}=\frac{1}{12}\)

c. \(\frac{7}{13}.\frac{5}{14}.\frac{39}{15}\)

= \(\frac{7.5.3.13}{13.2.7.3.5}\)

= \(\frac{1}{2}\)

A = 3.065

\(a,4\frac{1}{2}< 4\frac{3}{4}\)

\(b,2\frac{4}{5}< 3\frac{1}{4}\)

\(c,7\frac{2}{9}>5\frac{2}{9}\)

\(d,13\frac{5}{6}< 13\frac{6}{7}\)

Nao Tomori

\(a,4\frac{1}{2}....4\frac{3}{4}\Rightarrow4\frac{1}{2}=\frac{13}{2};4\frac{3}{4}=\frac{19}{4}\)

\(=4\frac{1}{2}< 4\frac{3}{4}\)

\(b,2\frac{4}{5}....3\frac{1}{4}\Rightarrow2\frac{4}{5}=\frac{14}{5};3\frac{1}{4}=\frac{13}{12}\)

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

\(c,7\frac{2}{9}....5\frac{2}{9}\Rightarrow7\frac{2}{9}=\frac{65}{9};5\frac{2}{9}=\frac{42}{9}\)

\(=7\frac{2}{9}>5\frac{2}{9}\)

\(d,13\frac{5}{6}....13\frac{6}{7}\Rightarrow13\frac{5}{6}=\frac{83}{6};13\frac{6}{7}=\frac{97}{7}\)

\(=13\frac{5}{6}< 13\frac{6}{7}\)

P/s: Quy đồng là bước trung gian nên mk ko ghi bước quy đồng nha

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