Răspuns :
a=30•31:2+11
a=15•31+2
a=467
b=18•19:2-(1+2+....+8)
b=9•19-8•9:2
b=9•19-4•9
b=9•(19-4)
b=9•15
b=135
a+b=467+135
a+b=602
a=15•31+2
a=467
b=18•19:2-(1+2+....+8)
b=9•19-8•9:2
b=9•19-4•9
b=9•(19-4)
b=9•15
b=135
a+b=467+135
a+b=602
Răspuns:
=611
Explicație pas cu pas:
1+2+3+...+30+11 = (30x31) : 2 = 15x31 = 465
465+11 = 476
a = 476
9+10+11+...+18 = (10x27) : 2 = 5x27 = 135
b = 135
a+b = 476+135+611
Sper ca te-am ajutat!