Question

1+2+3+4+5+1+2+3+4+5-10=

ai kết bạn thì tk

Answer 1

\(=20\)nhé bạn

Answer 2

1 + 2 + 3 + 4 + 5 + 1 + 2 + 3 + 4 + 5 - 10

= 1 x 2 + 2 x 2 + 3 x 2 + 4 x 2 + 5 x 2 - 10

= 2 + 4 + 6 + 8 + 10 - 10

= 2 + 2 + 2 + 2 + 2 + 2 +2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 - ( 2 + 2 + 2 + 2 + 2 )

= 2 x 15 - 2 x 5

= 2 x 10

= 20

Answer 3

1 + 2 + 3 + 4 + 5 + 1 + 2 + 3 + 4 + 5 - 10

= 2 + 4 + 6 + 8 + 10 - 10

= 2 + 2 + 2 + 2 + 2 + 2 +2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 + 2 - ( 2 + 2 + 2 + 2 + 2 )

= 2 x 15 - 2 x 5

= 2 x 10

= 20

Answer 4

\(1+2+3+4+5+1+2+3+4+5-10=20\)

Answer 5

1+2+3+4+5+1+2+3+4+5-10=20

Answer 6

20 nha bn

Answer 7

1 + 2 + 3 + 4 + 5 + 1 + 2 + 3 + 4 +  5 - 10

= ( 1 + 1 ) + ( 2 + 2 ) + ( 3 + 3 ) + ( 4 + 4 ) + ( 5 + 5 ) - 10

= 2 + 4 + 6 + 8 + 10 - 10

= 6 + 6 + 8 + 10 - 10

= 12 + 8 + 10 - 10

= 20 + 10 - 10

= 30 - 10

= 20

Answer 8

1+2+3+4+5+1+2+3+4+5-10=20

Answer 9

=20 nha 

Answer 10

1+2+3+4+5+1+2+3+4+5-10=20