Question

tính nhanh

1+2+3+...+100
 

Answer 1

1 + 2 + 3 + ... + 100

= (1 + 100) x 100 : 2

= 101 x 50

= 5050

Answer 2

đáp án 5050

Answer 3

1+2+3+...+100

=(1+100)x50

=101x50

=5050

Answer 4

=(1+100)+(2+99)+...+(50+51)

=101+101+101+...+101          (50 số hạng 101)

=101.50

=5050

Answer 5

So so hang cua day la: (100-1)+1=100(so hang)

Tong day so la: (100+1)x100:2=5050

Answer 6

1 + 2 + 3 + ... + 100

= ( 100 - 1 ) + 1

=      99       + 1

=            100

= ( 1 + 100 ) x 100 : 2

=     101      x 100 : 2

=          10100      : 2

=                   5050

Answer 7

1 + 2 + 3 +...+ 100

=(1 + 99) + (2 + 98) + (3 + 97) + ......(49 + 51) + 50 + 100

=100 + 100 + 100 +...+ 100 + 50

=50 x 100 + 50

=50 x (100 + 1)

=50 x 101

=5050

Ủng hộ nha ko ủng hộ thì k nhé

Answer 8

1 + 2 + 3 + ...+ 100

= ( 1 + 100) + ( 2 + 99) + ....+ ( 50 + 51 )

=    101   + 101 + ....+ 101 (CÓ 50 CẶP )

=     101 X 50 

=        5050

Answer 9

1+2+3+...+100

=(1+100)+(2+99)+3+98)+...+(50+51)

=101x50

=5050