해법
확장 (1+x)5(1+ax)6
해법
1+6ax+15a2x2+20a3x3+15a4x4+6a5x5+a6x6+5x+30ax2+75x3a2+100x4a3+75x5a4+30x6a5+5x7a6+10x2+60ax3+150x4a2+200x5a3+150x6a4+60x7a5+10x8a6+10x3+60ax4+150x5a2+200x6a3+150x7a4+60x8a5+10x9a6+5x4+30ax5+75x6a2+100x7a3+75x8a4+30x9a5+5x10a6+x5+6ax6+15x7a2+20x8a3+15x9a4+6x10a5+x11a6
솔루션 단계
(1+x)5(1+ax)6
(1+x)5 확장 :1+5x+10x2+10x3+5x4+x5
=(1+5x+10x2+10x3+5x4+x5)(1+ax)6
=(1+ax)6(1+5x+10x2+10x3+5x4+x5)
괄호 배포=(1+ax)6⋅1+(1+ax)6⋅5x+(1+ax)6⋅10x2+(1+ax)6⋅10x3+(1+ax)6⋅5x4+(1+ax)6x5
(1+ax)6⋅1+(1+ax)6⋅5x+(1+ax)6⋅10x2+(1+ax)6⋅10x3+(1+ax)6⋅5x4+(1+ax)6x5간소화하다 :(1+ax)6+5x(1+ax)6+10x2(1+ax)6+10x3(1+ax)6+5x4(1+ax)6+x5(1+ax)6
=(1+ax)6+5x(1+ax)6+10x2(1+ax)6+10x3(1+ax)6+5x4(1+ax)6+x5(1+ax)6
(1+ax)6 확장 :1+6ax+15a2x2+20a3x3+15a4x4+6a5x5+a6x6
=1+6ax+15a2x2+20a3x3+15a4x4+6a5x5+a6x6+5x(1+ax)6+10x2(1+ax)6+10x3(1+ax)6+5x4(1+ax)6+x5(1+ax)6
5x(1+ax)6 확장 :5x+30ax2+75x3a2+100x4a3+75x5a4+30x6a5+5x7a6
=1+6ax+15a2x2+20a3x3+15a4x4+6a5x5+a6x6+5x+30ax2+75x3a2+100x4a3+75x5a4+30x6a5+5x7a6+10x2(1+ax)6+10x3(1+ax)6+5x4(1+ax)6+x5(1+ax)6
10x2(1+ax)6 확장 :10x2+60ax3+150x4a2+200x5a3+150x6a4+60x7a5+10x8a6
=1+6ax+15a2x2+20a3x3+15a4x4+6a5x5+a6x6+5x+30ax2+75x3a2+100x4a3+75x5a4+30x6a5+5x7a6+10x2+60ax3+150x4a2+200x5a3+150x6a4+60x7a5+10x8a6+10x3(1+ax)6+5x4(1+ax)6+x5(1+ax)6
10x3(1+ax)6 확장 :10x3+60ax4+150x5a2+200x6a3+150x7a4+60x8a5+10x9a6
=1+6ax+15a2x2+20a3x3+15a4x4+6a5x5+a6x6+5x+30ax2+75x3a2+100x4a3+75x5a4+30x6a5+5x7a6+10x2+60ax3+150x4a2+200x5a3+150x6a4+60x7a5+10x8a6+10x3+60ax4+150x5a2+200x6a3+150x7a4+60x8a5+10x9a6+5x4(1+ax)6+x5(1+ax)6
5x4(1+ax)6 확장 :5x4+30ax5+75x6a2+100x7a3+75x8a4+30x9a5+5x10a6
=1+6ax+15a2x2+20a3x3+15a4x4+6a5x5+a6x6+5x+30ax2+75x3a2+100x4a3+75x5a4+30x6a5+5x7a6+10x2+60ax3+150x4a2+200x5a3+150x6a4+60x7a5+10x8a6+10x3+60ax4+150x5a2+200x6a3+150x7a4+60x8a5+10x9a6+5x4+30ax5+75x6a2+100x7a3+75x8a4+30x9a5+5x10a6+x5(1+ax)6
x5(1+ax)6 확장 :x5+6ax6+15x7a2+20x8a3+15x9a4+6x10a5+x11a6
=1+6ax+15a2x2+20a3x3+15a4x4+6a5x5+a6x6+5x+30ax2+75x3a2+100x4a3+75x5a4+30x6a5+5x7a6+10x2+60ax3+150x4a2+200x5a3+150x6a4+60x7a5+10x8a6+10x3+60ax4+150x5a2+200x6a3+150x7a4+60x8a5+10x9a6+5x4+30ax5+75x6a2+100x7a3+75x8a4+30x9a5+5x10a6+x5+6ax6+15x7a2+20x8a3+15x9a4+6x10a5+x11a6