해법
확장 (81x+6)26
해법
8126x26+8125⋅156x25+398⋅1300x24+395⋅20800x23+392⋅239200x22+389⋅2104960x21+386⋅14734720x20+383⋅84198400x19+380⋅399942400x18+377⋅1599769600x17+374⋅5439216640x16+371⋅15823175680x15+368⋅39557939200x14+3660800360⋅7.57933E19x13+281600357⋅1.08276E19x12+355⋅2.05068E13x11+356⋅348109864960x10+353⋅409541017600x9+350⋅409541017600x8+347⋅344876646400x7+344⋅241413652480x6+341⋅137950658560x5+338⋅62704844800x4+335⋅21810380800x3+332⋅5452595200x2+625⋅2106x+626
솔루션 단계
(81x+6)26
이항 정리 적용: (a+b)n=i=0∑n(in)a(n−i)bia=81x,b=6
=i=0∑26(i26)(81x)(26−i)⋅6i
합계 확장
=0!(26−0)!26!(81x)26⋅60+1!(26−1)!26!(81x)25⋅61+2!(26−2)!26!(81x)24⋅62+3!(26−3)!26!(81x)23⋅63+4!(26−4)!26!(81x)22⋅64+5!(26−5)!26!(81x)21⋅65+6!(26−6)!26!(81x)20⋅66+7!(26−7)!26!(81x)19⋅67+8!(26−8)!26!(81x)18⋅68+9!(26−9)!26!(81x)17⋅69+10!(26−10)!26!(81x)16⋅610+11!(26−11)!26!(81x)15⋅611+12!(26−12)!26!(81x)14⋅612+13!(26−13)!26!(81x)13⋅613+14!(26−14)!26!(81x)12⋅614+15!(26−15)!26!(81x)11⋅615+16!(26−16)!26!(81x)10⋅616+17!(26−17)!26!(81x)9⋅617+18!(26−18)!26!(81x)8⋅618+19!(26−19)!26!(81x)7⋅619+20!(26−20)!26!(81x)6⋅620+21!(26−21)!26!(81x)5⋅621+22!(26−22)!26!(81x)4⋅622+23!(26−23)!26!(81x)3⋅623+24!(26−24)!26!(81x)2⋅624+25!(26−25)!26!(81x)1⋅625+26!(26−26)!26!(81x)0⋅626
0!(26−0)!26!(81x)26⋅60간소화하다 :8126x26
1!(26−1)!26!(81x)25⋅61간소화하다 :8125⋅156x25
2!(26−2)!26!(81x)24⋅62간소화하다 :398⋅1300x24
3!(26−3)!26!(81x)23⋅63간소화하다 :395⋅20800x23
4!(26−4)!26!(81x)22⋅64간소화하다 :392⋅239200x22
5!(26−5)!26!(81x)21⋅65간소화하다 :389⋅2104960x21
6!(26−6)!26!(81x)20⋅66간소화하다 :386⋅14734720x20
7!(26−7)!26!(81x)19⋅67간소화하다 :383⋅84198400x19
8!(26−8)!26!(81x)18⋅68간소화하다 :380⋅399942400x18
9!(26−9)!26!(81x)17⋅69간소화하다 :377⋅1599769600x17
10!(26−10)!26!(81x)16⋅610간소화하다 :374⋅5439216640x16
11!(26−11)!26!(81x)15⋅611간소화하다 :371⋅15823175680x15
12!(26−12)!26!(81x)14⋅612간소화하다 :479001600368⋅1.89483E19x14
13!(26−13)!26!(81x)13⋅613간소화하다 :6227020800365⋅5.30553E20x13
14!(26−14)!26!(81x)12⋅614간소화하다 :479001600362⋅7.57933E19x12
15!(26−15)!26!(81x)11⋅615간소화하다 :492800355⋅1.01058E19x11
16!(26−16)!26!(81x)10⋅616간소화하다 :356⋅348109864960x10
17!(26−17)!26!(81x)9⋅617간소화하다 :353⋅409541017600x9
18!(26−18)!26!(81x)8⋅618간소화하다 :350⋅409541017600x8
19!(26−19)!26!(81x)7⋅619간소화하다 :347⋅344876646400x7
20!(26−20)!26!(81x)6⋅620간소화하다 :344⋅241413652480x6
21!(26−21)!26!(81x)5⋅621간소화하다 :341⋅137950658560x5
22!(26−22)!26!(81x)4⋅622간소화하다 :338⋅62704844800x4
23!(26−23)!26!(81x)3⋅623간소화하다 :335⋅21810380800x3
24!(26−24)!26!(81x)2⋅624간소화하다 :332⋅5452595200x2
25!(26−25)!26!(81x)1⋅625간소화하다 :625⋅2106x
26!(26−26)!26!(81x)0⋅626간소화하다 :626
=8126x26+8125⋅156x25+398⋅1300x24+395⋅20800x23+392⋅239200x22+389⋅2104960x21+386⋅14734720x20+383⋅84198400x19+380⋅399942400x18+377⋅1599769600x17+374⋅5439216640x16+371⋅15823175680x15+479001600368⋅1.89483E19x14+6227020800365⋅5.30553E20x13+479001600362⋅7.57933E19x12+492800355⋅1.01058E19x11+356⋅348109864960x10+353⋅409541017600x9+350⋅409541017600x8+347⋅344876646400x7+344⋅241413652480x6+341⋅137950658560x5+338⋅62704844800x4+335⋅21810380800x3+332⋅5452595200x2+625⋅2106x+626
479001600368⋅1.89483E19x14=368⋅39557939200x14
6227020800365⋅5.30553E20x13=3660800360⋅7.57933E19x13
479001600362⋅7.57933E19x12=281600357⋅1.08276E19x12
492800355⋅1.01058E19x11=355⋅2.05068E13x11
=8126x26+8125⋅156x25+398⋅1300x24+395⋅20800x23+392⋅239200x22+389⋅2104960x21+386⋅14734720x20+383⋅84198400x19+380⋅399942400x18+377⋅1599769600x17+374⋅5439216640x16+371⋅15823175680x15+368⋅39557939200x14+3660800360⋅7.57933E19x13+281600357⋅1.08276E19x12+355⋅2.05068E13x11+356⋅348109864960x10+353⋅409541017600x9+350⋅409541017600x8+347⋅344876646400x7+344⋅241413652480x6+341⋅137950658560x5+338⋅62704844800x4+335⋅21810380800x3+332⋅5452595200x2+625⋅2106x+626