熱心網友
設x^8+x^7+x^6+x^5+x^4+x^3+x^2+x+1=A ① 則Ax=x^9+x^8+x^7+x^6+x^5+x^4+x^3+x^2+x ② ②-①得 x^9-1=A(x-1) 所以:原式=A=(x^9-1)/(x-1)
熱心網友
8 x7 x6 x5 x4 x3 x2 x 1=(8x5x7)x(6x2)x3=280x12x3=280x36=10080
熱心網友
x^8+x^7+x^6+x^5+x^4+x^3+x^2+x+1=(x^9-1)/(x-1)這算化簡嗎?
設x^8+x^7+x^6+x^5+x^4+x^3+x^2+x+1=A ① 則Ax=x^9+x^8+x^7+x^6+x^5+x^4+x^3+x^2+x ② ②-①得 x^9-1=A(x-1) 所以:原式=A=(x^9-1)/(x-1)
8 x7 x6 x5 x4 x3 x2 x 1=(8x5x7)x(6x2)x3=280x12x3=280x36=10080
x^8+x^7+x^6+x^5+x^4+x^3+x^2+x+1=(x^9-1)/(x-1)這算化簡嗎?