Question

100+98+96+...+2-97-95-93-...-1

Answer 1

Q=(100-97)+(98-95)+....+(6-3)+(4+2-1)

Q=3+3+3+.....+3+5(48 chữ số 3)

Q= 48x3+5

Q= 144+5=149

k nha

Answer 2

100+98+96+...+2-97-95-93-...-1

=100+(98-97)+(96-95)+...+(2-1)

=100+(1+1+...+1)

=100+48=148

Answer 3

Ta có:

100 + 98 + 96 + .........+ 2 - 97 - 95 - 93 -...- 1

<=> 100 + 98 + 96 + ... + 2 - (97+ 95 + 93 + ... + 1)

<=> 50 x (100 + 2) : 2 - 33 x (97+1) : 2

<=> 2550 - 1617

<=> 933