chỉ cần đáp án 1+2+3+4+5+6+7+8+9+10= 2+1+9+3+5+2+6+6+5+2=

2 câu trả lời

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

`= (10 + 1) xx 10 : 2 `

`= 11 xx 10 : 2`

`= 110 : 2`

`= 55`

`_______________________________________`

`2 + 1 + 9 + 3 + 5 + 2 + 6 + 6 + 5 + 2`

`= (2 + 2 + 6) + (1 + 9) + (3 + 2 + 5 + 5) + 6`

`= 10 + 10 + 15 + 6`

`= 35 + 6`

`= 41`

 

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

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

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

= 50 + 5

=55

2+1+9+3+5+2+6+6+5+2

= (2 + 2 + 6 ) + ( 2 + 6) + (5 + 5 ) + (9 + 1) + 3

= 10 + 8 + 10 + 10 + 3

= 30 + 8 + 3

= 38 + 3

= 41