x + x : 0, 5 + x : 0, 25 + x : 0, 125 = 15
x + x . 2 + x . 4 + x . 8 = 15
x( 1 + 2 + 4 + 8 ) = 15
x . 15 = 15
x = 1
x=1
k mk nha!!!
x + x : 0, 5 + x : 0, 25 + x : 0, 125 = 15
x . 1 . 2 + x .4 + x . 8 = 15
x . (1+2+4+8) =15
x . 15 =15
x =15 :15
x =1