求x^8+x^7+1 因式分解~~~~~~ ^后的数字为次幂数~~~~
问题描述:
求x^8+x^7+1 因式分解~~~~~~ ^后的数字为次幂数~~~~
求解~~~~!
答
X^8+X^7+1 =X^8+X^7+X^6-X^6+1 =X^6(X^2+X+1)-(X^6-1) =X^6(X^2+X+1)-(X^3+1)(X^3-1) =X^6(X^2+X+1)-(X^3+1)(X-1)(X^2+X+1) =(X^2+X+1)[X^6-(X^3+1)(X-1)] =(X^2+X+1)(X^6-X^4+X^3-X+1)