Question

Aflati a=?,b=?,c=?.Daca a=1+2+3+.....9; b=11+22+33+.....+99; c=111+222+333+.....+999.

Answer 1

Răspuns:

a = 45

b =  495

c = 9990

Cu placere!

Answer 2

Răspuns:

a=1+2+3+.................+9

a= (1+9)+............(4+6)+5

a=10x4+5

a=45

b=11+22+33+.................+99

b= (11+99)+............(44+66)+55

b=110x4+55

b=440+55

b=495

c=111+222+333+.................+999

c= (111+999)+............(444+666)+555

c=1110x4+555

c=4440+555

c=4995

Explicație pas cu pas: