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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 99
= (11 + 88) + (22 + 77) + (33 + 66) + (44 + 55) + 99
= 99 + 99 + 99 + 99 + 99
= 99 x 5
= 495
![](https://rs.olm.vn/images/avt/0.png?1311)
11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 99
= (11 + 99) + (22 + 88) + (33 + 77) + (44 + 66) + 55
= 110 + 110 + 110 + 110 + 55
= 495
![](https://rs.olm.vn/images/avt/0.png?1311)
11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 99
= (11 + 99) + (22 + 88) + (33 + 77) + (44 + 66) + 55
= 110 + 110 +110 + 110 + 55
= 495
![](https://rs.olm.vn/images/avt/0.png?1311)
Tính bằng cách thuận tiện nhất:
11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 99
= (11 + 88) + (22 + 77) + (33 + 66) + (44 + 55) + 99
= 99 + 99 + 99 + 99 + 99
= 99 x 5
= 495
![](https://rs.olm.vn/images/avt/0.png?1311)
( 11 + 88 ) + ( 22 + 77 ) + ( 33 + 66 ) + ( 44 + 55 ) + 99
= 99 + 99 + 99 + 99 + 99
= 99 x 5
= 495
![](https://rs.olm.vn/images/avt/0.png?1311)
\(11+22+33+44+55+66+77+88+99\)
\(=\left(11+99\right)+\left(22+88\right)+\left(33+77\right)+\left(44+66\right)+55\)
\(=110+110+110+110+55\)
\(=550+55\)
\(=605\)
# Kukad'z Lee'z
![](https://rs.olm.vn/images/avt/0.png?1311)
11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 99
= (11 + 99) + (22 + 88) + (33 + 77) + (44 + 66) + 55
= 110 + 110 + 110 + 110 + 55
= 110 x 4 + 55
= 440 + 55
= 495
![](https://rs.olm.vn/images/avt/0.png?1311)
=(11+99)+(22+88)+(33+77)+(44+66)+55
=110+110+110+110+55
=110x4+55
=440+55
=495
![](https://rs.olm.vn/images/avt/0.png?1311)
=(11+99)+(22+88)+(33+77)+(44+66)+55
=100+100+100+100+55
=400+55
=455
=(11+99)+(22+88)+(33+77)+(44+66)+55
=100+100+100+100+55
=400+55
=455
![](https://rs.olm.vn/images/avt/0.png?1311)
11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 99
= ( 11 + 22) + ( 33 + 44) + ( 55 + 66) + (77 + 88) + 99
= 33 + 77 + 121 + 165 + 99
= 495
11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 99
= (11 + 99) + (22 + 88) + (33 + 77) + (44 + 66) + 55
= 110 + 110 +110 + 110 + 55
= 495
đáp án đây nhé
=495 nhé