88 + 99 + 11 + 22 + 33 + 44 + 55 + 66 + 77 = 495
88+99+11+22+33+44+55+66+77=495
Đáp số : 495
88 + 99 + 11 + 22 + 33 + 44 + 55 + 66 + 77
= ( 99 + 11 ) + ( 88 + 22 ) + ( 77 + 33 ) + ( 66 + 44 ) + 55
= 110 + 110 + 110 + 110 + 55
= 110 x 4 + 55
= 440 + 55
= 495
88 + 99 + 11 + 22 + 33 + 44 + 55 + 66 + 77 = 495
k mình nha
88 + 99 + 11 + 22 + 33 + 44 + 55 + 66 + 77
= 8 x 11 + 9 x 11 + 1 x 11 + 2 x 11 + 3 x 11 + 4 x 11 + 5 x 11 + 6 x 11 + 7x 11
= ( 8+ 9 + 1 + 2 + 3 + 4 + 5 + 6 + 7 ) x 11
= 45 x 11
= 495
=(88+22)+(99+11)+(77+33)+(66+44)+55
=110+110+110+110+55=495
88 + 99 + 11 + 22 + 33 + 44 + 55 + 66 + 77
= ( 99 + 11 ) + ( 88 + 22 ) + ( 77 + 33 ) + ( 66 + 44 ) + 55
= 110 + 110 + 110 + 110 + 55
= 110 x 4 + 55
= 440 + 55
= 495
= 990 nha bn