Răspuns :
a*5=a+504
5a=a+504
5a-a=504
4a=504
a=126
a:b=2 a=2b
b:c=2 b=2c a=2*2c=4c
a-c=135
4c-c=135
3c=135
c=45 a=180 b=90
5a=a+504
5a-a=504
4a=504
a=126
a:b=2 a=2b
b:c=2 b=2c a=2*2c=4c
a-c=135
4c-c=135
3c=135
c=45 a=180 b=90
ax5=a+504
ax5-a=504
4xa= 504
a= 504:4
a=126
Verificare:
126x5=126+504
630=630
ax5-a=504
4xa= 504
a= 504:4
a=126
Verificare:
126x5=126+504
630=630