Phân tích đa thức thành nhân tử: x^8 +x^7 +1
Giải thích
x8+x7+1=x8−x2+x7−x+x2+x+1=x2x6−1+xx6−1+x2+x+1=xx+1x6−1+x2+x+1=xx+1x3−1x3+1+x2+x+1=xx+1x−1x3+1x2+x+1+x2+x+1=x2+x+1xx+1x−1x3+1+1
x8+x7+1=x8−x2+x7−x+x2+x+1=x2x6−1+xx6−1+x2+x+1=xx+1x6−1+x2+x+1=xx+1x3−1x3+1+x2+x+1=xx+1x−1x3+1x2+x+1+x2+x+1=x2+x+1xx+1x−1x3+1+1