Question

a) 2/3+1/3:x=3/5

b) 10/3x +67/4=-13,25

c) x+30℅x=-1,3

d) (14/5x -50):2/3=51

e) 2/5+3/5.(3x-3,7)= -53/10

f) 2/3x -3/2x =5/12

Answer 1

a)

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

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

    \(\frac{1}{3}:x=\frac{-1}{15}\)

     \(x=\frac{1}{3}:\frac{-1}{15}\)

    \(x=-5\)

b)

     \(\frac{10}{3x}+\frac{67}{4}=-13.25\)

      \(\frac{10}{3x}+\frac{67}{4}=\frac{-53}{4}\)

       \(\frac{10}{3x}=\frac{-53}{4}+\frac{67}{4}\)

       \(\frac{10}{3x}=\frac{7}{2}\)

      \(\Rightarrow10.2=7.3x\)

            \(20=21x\)

            \(x=\frac{20}{21}\)

c)

        x+30%x=-1.3

        x+0.3x=-1.3

        x (1+0.3) = -1.3

        x . 1.3 = -1.3

        x = -1.3 : 1.3

        x = 1

d)

          \(\left(\frac{14}{5x}-50\right):\frac{2}{3}=51\)

           \(\frac{14}{5x}-50=51.\frac{2}{3}\)

             \(\frac{14}{5x}-50=34\)

             \(\frac{14}{5x}=34+50\)

              \(\frac{14}{5x}=84\)

               \(84.5x=14\)

              420x = 14

                   \(x=\frac{1}{30}\)

   

Answer 2

a, \(\frac{2}{3}+\frac{1}{3}:x=\frac{3}{5}\)

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

=>\(\frac{1}{3}:x=\frac{-1}{15}\)

=> \(x=\frac{1}{3}:\frac{-1}{15}\)

=> \(x=\frac{-1}{5}\)

Answer 3

mình sai chỗ kết quả cuối bằng -5 nhé

Answer 4

xin lỗi bn mk sai i 

Answer 5

\(x+30\%=-\frac{1}{3}\)

\(\Rightarrow x.\left(100\%+30\%\right)=-\frac{1}{3}\)

\(\Rightarrow x.130\%=-\frac{1}{3}\)

\(\Rightarrow x.1,3=-\frac{1}{3}\)

\(\Rightarrow x=-\frac{1}{3}:1,3\)