Question

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 +10 = ?

tính nhanh nha!!

Answer 1

=( 1+9)+(2+8)+(3+7)+(4+6)+5+10

=10+10+10+10+10+5

=55

hok tốt

Answer 2

kq=55

Answer 3

k mjk đi

Answer 4

kik mik nha

Answer 5

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 55

Answer 6

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 +10

=(1+9)+(2+8)+(3+7)+(4+6)+10+5

=10+10+10+10+10+5

=55

tính nhanh

tk mk nha!

Answer 7

1+2+3+4+5+6+7+8+9+10

=(1+9)+(2+8)+(3+7)+(4+6)+5+10

=10+10+10+10+5+10

=10*5+5

=50+5=55

Answer 8

bằng55

Answer 9

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10

= (1 + 9) + (2 + 8) + (3 + 7) + (4 + 6) + 5 + 10

= 10 + 10 + 10 + 10 + 10 + 5

= 55 

Answer 10

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10

= ( 1+ 9 ) + ( 2 + 8 ) + ( 3 + 7 ) + ( 4 + 6 ) + 5 + 10

= 10 + 10 + 10 + 10 + 5 + 10

= 10 x 5 + 5

= 50 + 5

= 55

Answer 11

1+2+3+4+5+6+7+8+9+10

=(1+10)+(2+9)+(3+8)+(4+7)+(5+6)

=11+11+11+11+11

=55

Answer 12

1+2+3+4+5+6+7+8+9+10

=(1+9)+(2+8)+(3+7)+(4+6)+10+5

=10+10+10+10+10+5

=10x5+5

=50+5

=55