해법
확장 (x32+y3)20
해법
64⋅232x20+1280323x19y+36480x18y2+109440⋅2323x17y3+139536032x16y4+44651523x15y5+16744320⋅232x14y6+33488640323x13y7+163257120x12y8+108838080⋅2323x11y9+35916566432x10y10+3265142403x9y11+367328520⋅232x8y12+226048320323x7y13+339072480x6y14+67814496⋅2323x5y15+6357609032x4y16+149590803x3y17+3739770⋅232x2y18+393660323xy19+59049y20
솔루션 단계
(x32+y3)20
=(32x+3y)20
이항 정리 적용: (a+b)n=i=0∑n(in)a(n−i)bia=x32,b=y3
=i=0∑20(i20)(x32)(20−i)(y3)i
합계 확장
=0!(20−0)!20!(x32)20(y3)0+1!(20−1)!20!(x32)19(y3)1+2!(20−2)!20!(x32)18(y3)2+3!(20−3)!20!(x32)17(y3)3+4!(20−4)!20!(x32)16(y3)4+5!(20−5)!20!(x32)15(y3)5+6!(20−6)!20!(x32)14(y3)6+7!(20−7)!20!(x32)13(y3)7+8!(20−8)!20!(x32)12(y3)8+9!(20−9)!20!(x32)11(y3)9+10!(20−10)!20!(x32)10(y3)10+11!(20−11)!20!(x32)9(y3)11+12!(20−12)!20!(x32)8(y3)12+13!(20−13)!20!(x32)7(y3)13+14!(20−14)!20!(x32)6(y3)14+15!(20−15)!20!(x32)5(y3)15+16!(20−16)!20!(x32)4(y3)16+17!(20−17)!20!(x32)3(y3)17+18!(20−18)!20!(x32)2(y3)18+19!(20−19)!20!(x32)1(y3)19+20!(20−20)!20!(x32)0(y3)20
0!(20−0)!20!(x32)20(y3)0단순화하세요:64⋅232x20
1!(20−1)!20!(x32)19(y3)1단순화하세요:1280323x19y
2!(20−2)!20!(x32)18(y3)2단순화하세요:36480x18y2
3!(20−3)!20!(x32)17(y3)3단순화하세요:109440⋅2323x17y3
4!(20−4)!20!(x32)16(y3)4단순화하세요:139536032x16y4
5!(20−5)!20!(x32)15(y3)5단순화하세요:44651523x15y5
6!(20−6)!20!(x32)14(y3)6단순화하세요:16744320⋅232x14y6
7!(20−7)!20!(x32)13(y3)7단순화하세요:33488640323x13y7
8!(20−8)!20!(x32)12(y3)8단순화하세요:163257120x12y8
9!(20−9)!20!(x32)11(y3)9단순화하세요:108838080⋅2323x11y9
10!(20−10)!20!(x32)10(y3)10단순화하세요:35916566432x10y10
11!(20−11)!20!(x32)9(y3)11단순화하세요:3265142403x9y11
12!(20−12)!20!(x32)8(y3)12단순화하세요:367328520⋅232x8y12
13!(20−13)!20!(x32)7(y3)13단순화하세요:226048320323x7y13
14!(20−14)!20!(x32)6(y3)14단순화하세요:339072480x6y14
15!(20−15)!20!(x32)5(y3)15단순화하세요:67814496⋅2323x5y15
16!(20−16)!20!(x32)4(y3)16단순화하세요:6357609032x4y16
17!(20−17)!20!(x32)3(y3)17단순화하세요:149590803x3y17
18!(20−18)!20!(x32)2(y3)18단순화하세요:3739770⋅232x2y18
19!(20−19)!20!(x32)1(y3)19단순화하세요:393660323xy19
20!(20−20)!20!(x32)0(y3)20단순화하세요:59049y20
=64⋅232x20+1280323x19y+36480x18y2+109440⋅2323x17y3+139536032x16y4+44651523x15y5+16744320⋅232x14y6+33488640323x13y7+163257120x12y8+108838080⋅2323x11y9+35916566432x10y10+3265142403x9y11+367328520⋅232x8y12+226048320323x7y13+339072480x6y14+67814496⋅2323x5y15+6357609032x4y16+149590803x3y17+3739770⋅232x2y18+393660323xy19+59049y20