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69339/3=23113 co tat ca so so hang la
16547/2=8273.5 (40-1)*1+1=40
86428/4=21607 tong day so la 25837/3=8612.3 (40+1)*40/5=820
(1+29)+(2+28)+(3+27)+(4+26)+(5+25)+(6+24)+(7+23)+(8+22)+(9+21)+(10+20)+(11+19)+(12+18)+(13+17)+(14+16)+15
=30+30+30+30+30+30+30+30+30+30+30+30+30+30+15
=30x14+15
=435
1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 + 13 + 14 + 15 + 16 + 17 + 18 + 19 + 20 + 21 + 22 + 23 + 24 + 25 + 26 + 27
=(1 + 19) + (2 +18) + (3 + 27) + (4 + 26) + (5 + 25) + (6 + 24) + (7 + 23) + (8 + 22) + (9 + 21) + (10 + 20) + (11 +19) + (12 + 18) + (13 + 17) + (14 + 16)
=20 + 20 + 30 + 30 + 30 + 30 + 30 + 30 + 30 + 30 + 30 + 30 + 30 + 15
=40 + 330 + 15
=381
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21=231
trả lời:
=231
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13 = XIII
14 = XIV
15 = XV
16 = XVI
17 = XVII
18 = XVIII
19 = XIX
20 = XX
21 = XXI
22 = XXII
23 = XXIII
24 = XXIV
25 = XXV
26 = XXVI
27 = XXVII
28 = XXVIII
29 = XXIX
30 = XXX
31 = XXXI
32 = XXXII
33 = XXXIII
TK NHA CÁC BN thanks!@@@@@@@
13.XIII
14,XIV
15.XV
16.XVI
17.XVII
18.XVIII
19.XIX
20.XX
21.XXI
22.XXII
23.XXIII
24,XXIV
25.XXV
26.XXVI
27.XXVII
28.XXVIII
29.XXIX
30.XXX
31.XXXI
32.XXXII
33.XXXIII
CÁC KÍ HIỆU LA MÃ LÀ CHỮ ;X,I,V
=1275
=1245