Question

calculati
2•(1+2+3+...+50)-(2+4+6+...98)​

Answer 1

Răspuns:

Explicație pas cu pas:

2 + 4 + 6 + ..... + 98 + 100 - 2 - 4 - 6 - .... - 98 = 100

Answer 2

2 × ( 1 + 2 + 3 + ... + 50 ) - ( 2 + 4 + 6 + ... + 98 ) =

2 × ( 50 × 51 : 2 ) - 2 × ( 1 + 2 + 3 + ... + 49 ) =

2 × ( 2550 : 2 ) - 2 × ( 49 × 50 : 2 ) =

2 × 1275 - 2 × ( 2450 : 2 ) =

2550 - 2 × 1225 =

2550 - 2450 = 100