x^729+x^243+x^81+x^27+x^9+x^3+x
=x^243(x^3-1)+2x^81(x^3-1)+3^x27(x^3-1)+4x^9(x^3-1)+5x^3(x3-1)+6(x^3-1)+6
前面所有项均可被x-1整除
故余数为6
x^729+x^243+x^81+x^27+x^9+x^3+x
=x^243(x^3-1)+2x^81(x^3-1)+3^x27(x^3-1)+4x^9(x^3-1)+5x^3(x3-1)+6(x^3-1)+6
前面所有项均可被x-1整除
故余数为6