Question

Tìm X :

a) 2/5 x 4 + X = 2 2/5

b) 155 x 2,7 - X = 98,3

Answer 1

\(a,\dfrac{2}{5}\times4+x=2\dfrac{2}{5}\\ \Rightarrow\dfrac{8}{5}+x=\dfrac{12}{5}\\ \Rightarrow x=\dfrac{12}{5}-\dfrac{8}{5}\\ \Rightarrow x=\dfrac{4}{5}\\ b,155\times2,7-x=98,3\\ \Rightarrow418,5-x=98,3\\ \Rightarrow x=418,5-98,3\\ \Rightarrow x=320,2\)

Answer 2

a) \(\dfrac{2}{5}\)x 4 +  X  = \(2\dfrac{2}{5}\)

       \(\dfrac{8}{5}\) + X = \(\dfrac{12}{5}\)

               X = \(\dfrac{12}{5}\)- \(\dfrac{8}{5}\)

               X = \(\dfrac{4}{5}\)

b) 155 x 2,7 - X = 98,3

          418,5 - X = 98,3

                      X = 418,5 - 98,3

                      X = 320,2

Answer 3

a) 225225

       125125

               X = 8585

               X =