Question

4 b) 100 - (9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1) =​

Answer 1

Salutare!:)

100-(9+8+7+6+5+4+3+2+1) =
100-(17+13+9+5+1)=
100-(30+9+5+1)=
100-(39+5+1)=
100-(44+1)=
100-45=
55

Answer 2

Răspuns:

100 - (9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1) =55

Explicație pas cu pas:

b) 100 - (9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1) =​100-9·10/2=100-9·5= 100-45=55

Am folosit formula sumei lui Gauss