từ đề bài: ta có:  1 -  x/17 - 2/17 + x/15 - 4/15 + x/13 - 6/13   =   x/11 - 8/11 + x/9 - 10/9 + x/7 - 12/7

    Tới đây thì tự giải nha

 x= -660/7;y=-80/7;z=-100/7

a) Ta có:

\(x-\left\{\left[-x-\left(x+3\right)\right]-\left[\left(x+2018\right)-\left(x+2019\right)\right]+21\right\}\)

\(=x-\left\{\left[-x-x-3\right]-\left[x+2018-x-2019\right]+21\right\}\)

\(=x-\left\{\left[-2x-3\right]-\left[2018-2019\right]+21\right\}\)

\(=x+2x+-3+1-21\)

\(=3x-23\)

=> \(3x-23=2020\)

\(3x=2020+23=2043\)

=> \(x=2043:3=681\)

Nhầm

\(=x-\left\{-2x-3+1+21\right\}\\ =x+2x+3-1-21\)

\(=3x-17\\ =>3x-17=2020\\ 3x=2020+17=2037\\ x=2037:3=679\)

\(a,\frac{2}{3}\cdot x-\frac{4}{7}=\frac{1}{8}\)

\(\Leftrightarrow\frac{2}{3}\cdot x=\frac{1}{8}+\frac{4}{7}\)

\(\Leftrightarrow\frac{2}{3}\cdot x=\frac{7}{56}+\frac{32}{56}\)

\(\Leftrightarrow\frac{2}{3}\cdot x=\frac{39}{56}\)

\(\Leftrightarrow x=\frac{39}{56}:\frac{2}{3}=\frac{39}{56}\cdot\frac{3}{2}=\frac{39\cdot3}{56\cdot2}=\frac{117}{112}\)

\(b,\frac{2}{7}-\frac{8}{9}\cdot x=\frac{2}{3}\)

\(\Leftrightarrow\frac{8}{9}\cdot x=\frac{2}{7}-\frac{2}{3}\)

\(\Leftrightarrow\frac{8}{9}\cdot x=\frac{6}{21}-\frac{14}{21}\)

\(\Leftrightarrow\frac{8}{9}\cdot x=\frac{-8}{21}\)

\(\Leftrightarrow x=\frac{-8}{21}:\frac{8}{9}=\frac{-8}{21}\cdot\frac{9}{8}=\frac{-8\cdot9}{21\cdot8}=\frac{-1\cdot3}{7\cdot1}=\frac{-3}{7}\)

Làm nốt hai bài cuối đi nhé

Study well >_<

Mk k chép lại đề bài nha

a)\(\frac{2}{3}.x=\frac{1}{8}+\frac{4}{7}\)

   \(\frac{2}{3}.x=\frac{7}{56}+\frac{32}{56}\)

    \(\frac{2}{3}.x=\frac{39}{56}\)

     \(x=\frac{39}{56}:\frac{2}{3}\)

     \(x=\frac{39}{56}.\frac{3}{2}\)

     \(x=\frac{117}{112}\)

Mk sợ sai lém!!!

c) \(\frac{5}{4}:x=\frac{1}{5}-\frac{4}{7}\)

     \(\frac{5}{4}:x=\frac{7}{35}-\frac{20}{35}\)

      \(\frac{5}{4}:x=\frac{-13}{35}\)

      \(x=\frac{5}{4}:\frac{-13}{35}\)

      \(x=\frac{5}{4}.\frac{35}{-13}\)

      \(x=\frac{175}{-52}\)

Hok tốt!!!

\(2009-\left(4\frac{5}{9}+x-7\frac{7}{18}\right):15\frac{2}{3}=2008\)

\(2009-\left(\frac{41}{9}+x-\frac{133}{8}\right):\frac{47}{3}=2008\)

\(2009-\left(\frac{41}{9}+x-\frac{133}{8}\right)\times\frac{3}{47}=2008\)

\(2009-\frac{41}{9}\times\frac{3}{47}-x\times\frac{3}{47}+\frac{133}{8}\times\frac{3}{47}=2008\)

\(2009-\frac{41}{141}-x\times\frac{3}{47}+\frac{399}{376}=2008\)

\(2009+(\frac{399}{376}-\frac{41}{141})-x\times\frac{3}{47}=2008\)

\((2009+\frac{869}{1128})-x\times\frac{3}{47}=2008\)

\(x\times\frac{3}{47}=2009+\frac{869}{1128}-2008\)

\(x\times\frac{3}{47}=1\frac{869}{1128}\)

\(x\times\frac{3}{47}=\frac{1997}{1128}\)

\(x=\frac{1997}{1128}:\frac{3}{47}\)

\(x=\frac{1997}{72}\)

\(2009-\left(4\frac{5}{9}+x-7\frac{7}{18}\right):15\frac{2}{3}=\)2008

\(\left(\frac{41}{9}+x-\frac{133}{18}\right):\frac{47}{3}=2009-2008\)

\(\left(\frac{41}{9}+x-\frac{133}{18}\right)=1.\frac{47}{3}=\frac{47}{3}\)

\(\frac{82}{18}+x-\frac{133}{18}=\frac{47}{3}\)

\(x=\frac{282}{18}-\frac{82}{18}+\frac{133}{18}\)

\(x=\frac{333}{18}=\frac{37}{2}\)

Đáp số \(x=\frac{37}{2}\)

xin lỗi bn dấu nhân nó bị trùng với x nên mk thay dấu nhân thành dấu "." theo cách lớp 6 nha.

Nếu có chỗ nào sai thì mk xin lỗi các bạn và mong các bạn góp ý 

*****Chúc bạn học giỏi*****

\(a)\) \(\frac{x-1}{3}=\frac{x+2}{4}\)

\(\Leftrightarrow\)\(\frac{4\left(x-1\right)}{12}=\frac{3\left(x+2\right)}{12}\)

\(\Leftrightarrow\)\(4\left(x-1\right)=3\left(x+2\right)\)

\(\Leftrightarrow\)\(4x-4=3x+6\)

\(\Leftrightarrow\)\(4x-3x=6+4\)

\(\Leftrightarrow\)\(x=10\)

Vậy \(x=10\)

Câu b) thiếu đề nhé bạn 

Chúc bạn học tốt ~ 

Thanks bạn Phùng Minh Quân nha!

Mk chỉnh lại cau b nè:

b, Tìm x € Z để \(B=\frac{2x+9}{x-1}\)có giá trị nguyên.

\(b)\) Ta có : 

\(B=\frac{2x+9}{x-1}=\frac{2x-2+11}{x-1}=\frac{2x-2}{x-1}+\frac{11}{x-1}=\frac{2\left(x-1\right)}{x-1}+\frac{11}{x-1}=2+\frac{11}{x-1}\)

Để B có giá trj nguyên thì \(\frac{11}{x-1}\) có giá trị nguyên \(\Rightarrow\)\(11⋮\left(x-1\right)\)\(\Rightarrow\)\(\left(x-1\right)\inƯ\left(11\right)\)

Mà \(Ư\left(11\right)=\left\{1;-1;11;-11\right\}\)

Suy ra : 

Vậy \(x\in\left\{-10;0;2;12\right\}\)

Chúc bạn học tốt ~ 

\(\frac{3}{4}x-\frac{2}{3}.\left(\frac{3}{5}x-\frac{6}{5}\right)=\frac{1}{7}-\frac{2}{9}x\)

\(\frac{3}{4}x-\frac{2}{5}x+\frac{4}{5}=\frac{1}{7}-\frac{2}{9}x\)

\(\left(\frac{3}{4}-\frac{2}{5}\right)x+\frac{4}{5}=\frac{1}{7}-\frac{2}{9}x\)

\(\left(\frac{15}{20}-\frac{8}{20}\right)x+\frac{4}{5}=\frac{1}{7}-\frac{2}{9}x\)

\(\frac{7}{20}x+\frac{4}{5}=\frac{1}{7}-\frac{2}{9}x\)

\(\frac{1}{7}-\frac{4}{5}=\frac{2}{9}x-\frac{7}{20}x\)

\(\frac{5}{35}-\frac{28}{35}=\left(\frac{2}{9}-\frac{7}{20}\right)x\)

\(\frac{-23}{35}=\left(\frac{40}{180}-\frac{63}{180}\right)x\)

\(\frac{-23}{180}x=\frac{-23}{35}\)

\(x=\frac{-23}{35}:\frac{-23}{180}\)

\(x=\frac{-23}{35}.\frac{180}{-23}\)

\(x=\frac{180}{35}\)

Vậy \(x=\frac{180}{35}\)

Chúc bạn học tốt