a, x=15

b,x=7

a) \(\frac{24}{x}\div\frac{8}{3}=\frac{3}{5}\)

\(\frac{24}{x}\cdot\frac{3}{8}=\frac{3}{5}\)

\(\frac{24}{x}=\frac{3}{5}\div\frac{3}{8}\)

\(\frac{24}{x}=\frac{24}{15}\)

Vậy x = 15

b) Tương tự

Erza

a) \(\frac{3}{5}-\frac{1}{3}-\frac{1}{6}=\frac{18}{30}-\frac{10}{30}-\frac{5}{30}=\frac{18-10-5}{30}=\frac{1}{10}\)

b) \(\frac{4}{7}\times\frac{5}{8}\times\frac{7}{12}=\frac{4\times5\times7}{7\times8\times12}=\frac{140}{672}=\frac{5}{24}\)

c) \(\frac{25}{28}\div\frac{15}{14}\times\frac{6}{7}=\frac{25}{28}\times\frac{14}{15}\times\frac{6}{7}=\frac{25\times14\times6}{28\times15\times7}=\frac{2100}{2940}=\frac{5}{7}\)

                    Thấy đúg thì tk nha các bn !!

a,3/5 - 1/3 - 1/6

= 4/9 - 1/6

= 5/9

b,4/7x5/8x7/12

= 5/14 x 7/12

= 5/24

c,25/18 :15/14 x 6/7

= 25/28 x 14/15 x 6/7

= 5/6 x 6/7

= 5/7

\(a,\frac{7+x}{12}=\frac{2}{3}\)

\(=>7+x.3=12.2\)

\(3\left(7+x\right)=24\)

\(\left(7+x\right)=24:3\)

\(7+x=8\)

\(x=8-7\)

\(x=1\)

\(b,\frac{25-x}{8}=\frac{1}{2}\)

\(25-x.2=8.1\)

\(2\left(25-x\right)=8\)

\(25-x=8:2\)

\(25-x=4\)

\(x=25-4\)

\(x=21\)

\(x+\frac{15}{7}=\frac{9}{2}\)

\(x=\frac{9}{2}-\frac{15}{7}=\frac{33}{14}\)

\(x-\frac{3}{4}=\frac{7}{2}\)

\(x=\frac{7}{2}+\frac{3}{4}=\frac{17}{4}\)

\(x.\frac{7}{8}=\frac{12}{5}\)

\(x=\frac{12}{5}:\frac{7}{8}=\frac{96}{35}\)

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

\(x=\frac{5}{6}:\frac{4}{3}=\frac{5}{8}\)

• a) x=9/2-15/7=33/14
• b) x=7/2+3/4=17/4
• c) x=12/5:7/8=61/35
• d) x=5/6:4/3=5/8
• k nha

a,

x.2/7.3/4=5/21

x.3/14=5/21

x=5/21:3/14

x=10/9

b, 

x.1/2=1/3

x=1/3:1/2

x=2/3

c,

x:4/5=25/8:5/4

x:4/5=5/2

x=5/2.4/5=2

A, x= 5/25 : 3/4 : 2/7 = 14/15

B, x=1/3 : 1/2 = 2/3

C, x=(25/8 : 5/4)x4/5 = 5/2 x 4/5 = 2

bài 6 \(\frac{2}{2\times4}+\frac{2}{4\times6}+\frac{2}{6\times8}+\ldots+\frac{2}{80\times82}+\frac{2}{82\times84}\)

= \(\frac12-\frac14+\frac14-\frac16+\frac16-\cdots+\frac{1}{80}-\frac{1}{82}+\frac{1}{82}-\frac{1}{84}\)

= \(\frac12-\left(\frac14-\frac14\right)-\left(\frac16-\frac16\right)-\cdots-\left(\frac{1}{82}-\frac{1}{82}\right)-\frac{1}{84}\)

=\(\frac12-0-0-\frac{1}{84}\)

=\(\frac12\) - \(\frac{1}{84}\)

=\(\frac{42}{84}-\frac{1}{84}\)

=\(\frac{41}{84}\)

Bài 7

a)\(\frac{19}{4}=4\frac34\)

b)\(\frac{27}{5}=5\frac25\)

c)\(\frac{56}{8}=7\frac08\)

a.\(\frac{11}{14}-\frac{3}{x-1}=\frac{5}{14}\)

                \(\frac{3}{x-1}=\frac{11}{14}-\frac{5}{14}\)

                \(\frac{3}{x-1}=\frac{3}{7}\)

\(\Rightarrow x-1=7\)

              \(x=7+1\)

       Vậy \(x=8\)

b.\(\frac{42}{25}:\frac{2x+1}{5}=\frac{6}{5}\)

           \(\frac{2x+1}{5}=\frac{42}{25}:\frac{6}{5}\)

           \(\frac{2x+1}{5}=\frac{7}{5}\)

\(\Rightarrow2x+1=7\)

             \(2x=7-1\)

             \(2x=6\)

               \(x=6:2\)

\(x=3\)

a.\(\frac{11}{14}-\frac{3}{x-1}=\frac{5}{14}\)

             \(\frac{3}{x-1}=\frac{11}{14}-\frac{5}{14}=\frac{3}{7}\)

           \(\Rightarrow x-1=7\)

                \(x=7+1=8\)

      VẬY, \(x=8\)

b. \(\frac{42}{25}:\frac{2x+1}{5}=\frac{6}{5}\)

            \(\frac{2x+1}{5}=\frac{42}{25}:\frac{6}{5}=\frac{7}{5}\)

          \(\Rightarrow2x+1=7\)

                        \(2x=7-1=6\)

                          \(x=6:2=3\)

            VẬY, \(x=3\)