Răspuns :
175-57:X*9=139
\\ -57:X*9=-36
\\ -57:X=-4
\\ X= -4*(-57)
\\ X= 228
{ * = inmultit }
35x5-57:X×9=139
175-57:X×9=139
57:Xx9=175-139
57:X×9=36
57:X=36:9
57:X=4
X=57:4
x=14,25
V: 35x5-57:14,25x9=139
175-4x9=139
175-36 = 139
R: X=14,25
175-57:X×9=139
57:Xx9=175-139
57:X×9=36
57:X=36:9
57:X=4
X=57:4
x=14,25
V: 35x5-57:14,25x9=139
175-4x9=139
175-36 = 139
R: X=14,25