Question

TÌM X : 

a) ( x + 5/6 ) × 12/5 - 5/4 = 35%

b)  3 × ( x - 1/2 ) - 5 ×  ( x + 3/5 ) = -x + 1/5 

c)  5/2 - 3 × ( 1/3 - x ) = 1/4 - 7x

d)  1/2x + 4/5 × ( 5/2 + x ) = 15 /4 

Answer 1

a) (x + 5/6) . 12/5 - 5/4 = 35%

=> (x + 5/6) . 12/5 = 7/20 + 5/4

=> (x + 5/6) . 12/5 = 8/5

=> x + 5/6 = 8/5 : 12/5

=> x + 5/6 = 2/3

=> x = 2/3 - 5/6 

=> x = -1/6

b) 3.(x - 1/2) - 5.(x + 3/5) = -x + 1/5

=> 3x - 3/2 - 5x - 3 = -x + 1/5

=> -2x - 9/2 = -x + 1/5

=> -2x + x = 1/5 + 9/2

=> -x = 47/10

=> x = -47/10

Answer 2

c) 5/2 - 3.(1/3 - x) = 1/4 - 7x

=> 5/2 - 1 + 3x = 1/4 - 7x

=> 3/2 + 3x = 1/4 - 7x

=> 3/x + 7x = 1/4 - 3/2

=> 10x = -5/4

=> x = -5/4 : 10

=> x = -1/8

d) 1/2x + 4/5 .(5/2 + x) = 15/4

=> 1/2x + 2 + 4/5x = 15/4

=> 13/10x = 15/4 - 2

=> 13/10x = 7/4

=> x = 7/4 : 13/10

=>  x=  35/26

Answer 3

a. \(\left(x+\frac{5}{6}\right).\frac{12}{5}-\frac{5}{4}=\frac{35}{100}\)

\(\left(x+\frac{5}{6}\right).\frac{12}{5}-\frac{5}{4}=\frac{7}{20}\)

\(\left(x+\frac{5}{6}\right).\frac{12}{5}=\frac{7}{20}+\frac{5}{4}\)

\(\left(x+\frac{5}{6}\right).\frac{12}{5}=\frac{7}{20}+\frac{25}{20}\)

\(\left(x+\frac{5}{6}\right).\frac{12}{5}=\frac{32}{20}\)

\(\left(x+\frac{5}{6}\right).\frac{12}{5}=\frac{8}{5}\)

\(x+\frac{5}{6}=\frac{8}{5}:\frac{12}{5}\)

\(x+\frac{5}{6}=\frac{8}{5}.\frac{5}{12}\)

\(x+\frac{5}{6}=\frac{2}{3}\)

\(x=\frac{2}{3}-\frac{5}{6}\)

\(x=\frac{4}{6}-\frac{5}{6}\)

\(x=\frac{-1}{6}\)

Answer 4

b. \(3.\left(x-\frac{1}{2}\right)-5.\left(x+\frac{3}{5}\right)=-x\) \(+\frac{1}{5}\)

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

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

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

\(\left(-2+1\right)x-\frac{3}{2}=\frac{16}{5}\)

\(-1x=\frac{16}{5}+\frac{3}{2}\)

\(-1x=\frac{47}{10}\)

\(x=-\frac{47}{10}\)

Answer 5

\(\left(x+\frac{5}{6}\right).\frac{12}{5}-\frac{5}{4}=35\%\)

\(\Rightarrow\left(x+\frac{5}{6}\right).\frac{12}{5}-\frac{5}{4}=\frac{7}{20}\)

\(\Rightarrow\left(x+\frac{5}{6}\right).\frac{12}{5}=\frac{7}{20}+\frac{5}{4}\)

\(\Rightarrow\left(x+\frac{5}{6}\right).\frac{12}{5}=\frac{8}{5}\)

\(\Rightarrow x+\frac{5}{6}=\frac{8}{5}:\frac{12}{5}\)

\(\Rightarrow x+\frac{5}{6}=\frac{2}{3}\)

\(\Rightarrow x=\frac{2}{3}-\frac{5}{6}\)

\(\Rightarrow x=\frac{-1}{6}\)

~ Hok tốt ~

Answer 6

\(\left(x+\frac{5}{6}\right).\frac{12}{5}-\frac{5}{4}=35\%\)

\(\left(x+\frac{5}{6}\right).\frac{12}{5}-\frac{5}{4}=\frac{7}{20}\)

\(\left(x+\frac{5}{6}\right).\frac{12}{5}=\frac{7}{20}+\frac{5}{4}\)

\(\left(x+\frac{5}{6}\right).\frac{12}{5}=\frac{8}{5}\)

\(\left(x+\frac{5}{6}\right)=\frac{8}{5}:\frac{12}{5}\)

\(x+\frac{5}{6}=\frac{2}{3}\)

\(x=\frac{2}{3}-\frac{5}{6}\)

\(x=-\frac{1}{6}\)

Vậy \(x=-\frac{1}{6}\)