Question

Ajutatima la 3 exerciti... dau coroana.... 51+(x+23)+26= 100... 1+2+3+4+x+6+7+8+9= 550

Answer 1

51+(x+23)+26=100
x+23+77=100
x+100=100
x=0

1+2+3+4+x+...+9=550
1+2+3+4+5+....+9+x-5=550
9 *10/2+x=555
9*5+x=555
45+x=555
x=510

Sper ca te-am ajutat.