Răspuns :
x; y= numerele
x+y= 45
54- x= (x+y) + 9 cum x+y=45 inlocuim in paranteza
54-x= 45+9
54-x=54
-x=54-54
-x=0 deci x=0
0+y=45=> y=45
x+y= 45
54- x= (x+y) + 9 cum x+y=45 inlocuim in paranteza
54-x= 45+9
54-x=54
-x=54-54
-x=0 deci x=0
0+y=45=> y=45
a si b = numerele
a + b = 45
54 - a = 45 + 9
54 - a = 54
a = 54 - 54
a= 0
0 + b =45
b = 45 - 0
b = 45
verificarea : 0 + 45 = 45
a + b = 45
54 - a = 45 + 9
54 - a = 54
a = 54 - 54
a= 0
0 + b =45
b = 45 - 0
b = 45
verificarea : 0 + 45 = 45