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\(100-99+88-77+66-55+44-33+22-11\\ =\left(100-99\right)+\left(88-77\right)+\left(66-55\right)+\left(44-33\right)+\left(22-11\right)\\ =1+11+11+11+11\\ =1+11\times4\\ =1+44\\ =45\)
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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
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(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
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33 x 11 = 363
44 x 11 = 484
55 x 11 = 605
66 x 11 = 726
77 x 11 = 847 k cho mình nha
33 x 11 = 363
44 x 11 = 484
55 x 11 = 605
66 x 11 = 726
77 x 11 = 847
33+44+55+66+77+88+99=437
nhớ t cho mk nha
33 + 44 + 55 + 66 + 77 + 88 + 99
= ( 33 + 66 ) + ( 44 + 55 ) + 77 + 88 + 99
= 100 + 100 + 77 + 88 + 99
= 200 + 77 + 88 + 99
= 277 + 88 + 99
= 365 + 99
= 464