Răspuns :
a=numarul
a*5=a+504
5a-a=504
4a=504
a=126
Verificare : 126*5=126+504⇒630=630 Adevarat
a*5=a+504
5a-a=504
4a=504
a=126
Verificare : 126*5=126+504⇒630=630 Adevarat
x-numărul necunoscut
x*5⇔x+504
5x=x+504 mai clar x+504=5x
5x-x=504
4x=504
x=504:4
x=126
Verificare: x*5⇔x+504
126*5⇔126+504
630⇔630 (A)
x*5⇔x+504
5x=x+504 mai clar x+504=5x
5x-x=504
4x=504
x=504:4
x=126
Verificare: x*5⇔x+504
126*5⇔126+504
630⇔630 (A)