Question

Tìm X biết :

a) 7,24 x X + 2,76 x X = 35

b) 3/4 - ( X + 1/7 ) = 6 - 11/2

 

Answer 1

a) 7,24 x X + 2,76 x X = 35

   (7,24 + 2,76) x X     = 35

           10        x X     = 35

                         X     = 35 : 10

                         X     =    3,5

b) \(\frac{3}{4}\) - \(\left(x+\frac{1}{7}\right)\) = 6 - \(\frac{11}{2}\)

    \(\frac{3}{4}\) - X + \(\frac{1}{7}\)          =   \(\frac{1}{2}\)

    \(\frac{3}{4}\) - X                  = \(\frac{1}{2}\) - \(\frac{1}{7}\)

    \(\frac{3}{4}\) - X                  =     \(\frac{5}{14}\)

           X                  = \(\frac{3}{4}\) - \(\frac{5}{14}\)

           X                  =     \(\frac{11}{28}\)