Question

Tìm X

a, X + 20% x X = 7,2

b, X x 4 + 1/2 x X= 55,35

c,40% x X + X x 20% = 72

d, X - 20% x X = 216

Answer 1

a, X + 20% x  X = 7,2

     X + 1/5 x X = 7,2

    X + 1/5 x X + 1 = 7,2

     X . ( 1/5 + 1 ) = 7,2

       X . 1,2 = 7,2

      X = 7,2 : 1,2

       X = 6

      Vậy X =6

   

Answer 2

Dap an ; x = 6 

      OK ? Bai minh lam giong may ban do .

Answer 3

a) X=6

b) X=12,3

c) X=120

d) X= 270