x的六次方加6乘以x的五次方加15乘以x的四次方加20乘以x的立方加15乘...
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x^6+6x^5+15x^4+20x^3+15x^2+6x+1
=x^4(x^2+2x+1)+4x^3(x^2+2x+1)+6x^2(x^2+2x+1)+4x(x^2+2x+1)+(x^2+2x+1)
=x^4(x+1)^2+4x^3(x+1)^2+6x^2(x+1)^2+4x(x+1)^2+(x+1)^2
=(x+1)^2(x^4+4x^3+6x^2+4x+1)
=(x+1)^2[x^2(x^2+2x+1)+2x(x^2+2x+1)+(x^2+2x+1)]
=(x+1)^2[x^2(x+1)^2+2x(x+1)^2+(x+1)^2]
=(x+1)^4(x^2+2x+1)
=(x+1)^6
