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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(100-99+88-77+66-55+44-33+22-11\\ =\left(100-99\right)+\left(88-77\right)+\left(66-55\right)+\left(44-33\right)+\left(22-11\right)\\ =1+11+11+11+11\\ =1+11\times4\\ =1+44\\ =45\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](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 + 00
= ( 11 + 99 ) + ( 22 + 88 ) + ( 33 + 77 ) + ( 44 + 66 ) + 55
= 110 + 110 + 110 + 110 + 55
= 110 x 4 + 55
= 440 + 55
= 495
11+99+22+88+44+66+55+00
=100+100+100+55
=355
is so easy
![](https://rs.olm.vn/images/avt/0.png?1311)
(88+66+22+44):2
= 220 : 2
= 110
(11+33+55+77+99):5
= 275 : 5
= 55
Đừng trừ điểm nha
(88+66+22+44):2 (11+33+55+77+99):5
=(88+22+66+44):2 =(11+99+33+77+55):5
= 220:2 =275 :5
=110 =55
![](https://rs.olm.vn/images/avt/0.png?1311)
\(22+78+22+33+44+88+66+100\)
\(=\left(22+78\right)+\left(22+88\right)+\left(44+66\right)+33+100\)
\(=100+110+110+33+100\)
\(=453\)
bằng 453
k giúp mình nhé