Question

-4/9 + ( -5/6 ) - 17/4

Tìm x :

-x - 2/3 = - 6/7 

4/7 -x = 1/3

Answer 1

\(-\frac{4}{9}+\left(-\frac{5}{6}\right)-\frac{17}{4}=-\frac{199}{36}\)

\(-x-\frac{2}{3}=-\frac{6}{7}\)

\(\Rightarrow-x=-\frac{6}{7}+\frac{2}{3}\)

\(\Rightarrow-x=-\frac{4}{21}\)

\(\Rightarrow x=\frac{4}{21}\)

\(\frac{4}{7}-x=\frac{1}{3}\)

\(\Rightarrow x=\frac{4}{7}-\frac{1}{3}\)

\(\Rightarrow x=\frac{5}{21}\)

Answer 2

1. -4/9 + ( -5/6) -17/4

     = -23/18 - 17/4 = -199/36

  2.tìm x

   a. -x - 2/3 = -6/7

       -x = -6/7 +2/3

       -x = -4/21

        x=4/21

   b. 4/7 - x = 1/3

          x = 4/7 - 1/3

          x =5/21 

Answer 3

-4/9 + ( -5/6 ) - 17/4

= -23/54 - 17/4

= -199/36

Tìm x :

-x - 2/3 = -6/7

        -x  = -6/7 + 2/3

       - x  = -4/21

         x  = 4/21

4/7 - x = 1/3

         x = 4/7 - 1/3

         x = 5/21