解答
化简 (1+i)22
解答
−2048i
求解步骤
(1+i)22
使用二项式定理: (a+b)n=i=0∑n(in)a(n−i)bia=1,b=i
=i=0∑22(i22)⋅1(22−i)ii
展开求和
=0!(22−0)!22!⋅122i0+1!(22−1)!22!⋅121i1+2!(22−2)!22!⋅120i2+3!(22−3)!22!⋅119i3+4!(22−4)!22!⋅118i4+5!(22−5)!22!⋅117i5+6!(22−6)!22!⋅116i6+7!(22−7)!22!⋅115i7+8!(22−8)!22!⋅114i8+9!(22−9)!22!⋅113i9+10!(22−10)!22!⋅112i10+11!(22−11)!22!⋅111i11+12!(22−12)!22!⋅110i12+13!(22−13)!22!⋅19i13+14!(22−14)!22!⋅18i14+15!(22−15)!22!⋅17i15+16!(22−16)!22!⋅16i16+17!(22−17)!22!⋅15i17+18!(22−18)!22!⋅14i18+19!(22−19)!22!⋅13i19+20!(22−20)!22!⋅12i20+21!(22−21)!22!⋅11i21+22!(22−22)!22!⋅10i22
化简 0!(22−0)!22!⋅122i0:1
化简 1!(22−1)!22!⋅121i1:22i
化简 2!(22−2)!22!⋅120i2:231i2
化简 3!(22−3)!22!⋅119i3:1540i3
化简 4!(22−4)!22!⋅118i4:7315i4
化简 5!(22−5)!22!⋅117i5:26334i5
化简 6!(22−6)!22!⋅116i6:74613i6
化简 7!(22−7)!22!⋅115i7:170544i7
化简 8!(22−8)!22!⋅114i8:319770i8
化简 9!(22−9)!22!⋅113i9:497420i9
化简 10!(22−10)!22!⋅112i10:646646i10
化简 11!(22−11)!22!⋅111i11:705432i11
化简 12!(22−12)!22!⋅110i12:646646i12
化简 13!(22−13)!22!⋅19i13:497420i13
化简 14!(22−14)!22!⋅18i14:319770i14
化简 15!(22−15)!22!⋅17i15:170544i15
化简 16!(22−16)!22!⋅16i16:74613i16
化简 17!(22−17)!22!⋅15i17:26334i17
化简 18!(22−18)!22!⋅14i18:7315i18
化简 19!(22−19)!22!⋅13i19:1540i19
化简 20!(22−20)!22!⋅12i20:231i20
化简 21!(22−21)!22!⋅11i21:22i21
化简 22!(22−22)!22!⋅10i22:i22
=1+22i+231i2+1540i3+7315i4+26334i5+74613i6+170544i7+319770i8+497420i9+646646i10+705432i11+646646i12+497420i13+319770i14+170544i15+74613i16+26334i17+7315i18+1540i19+231i20+22i21+i22
化简 1+22i+231i2+1540i3+7315i4+26334i5+74613i6+170544i7+319770i8+497420i9+646646i10+705432i11+646646i12+497420i13+319770i14+170544i15+74613i16+26334i17+7315i18+1540i19+231i20+22i21+i22:−2048i
=−2048i