关于杨辉三角形的问题化简:(x-1)^5+5(x-1)^4+10(x-1)^3+10(x-1)^2+5(x-1)a^5+5a^4+10a^3+10a^2+5a+1=(a+1)^5(x-1)^5+5(x-1)^4+10(x-1)^3+10(x-1)^2+5(x-1)=(x-1)^5+5(x-1)^4+10(x-1)^3+10(x-1)^2+5(x-1)+1-1=(x-1+1)^5-1=x^5-1为什么【a^5+5a^4+10a
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