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x²=x-1
x^10=(x²)^5
=(x-1)^5
=(x-1)²(x-1)²(x-1)
=(x²-2x+1)(x²-2x+1)(x-1)
=(x-1-2x+1)(x-1-2x+1)(x-1)
=(-x)(-x)(x-1)
=x²(x-1)
=(x-1)(x-1)
=x²-2x+1
=x-1-2x+1
=-x
x^20=(x^10)²=x²
x^30=(x^10)^3=-x^3
原式=-x^3+x²-x
=-x(x²-x+1)
=0
解答完毕！
x^10=(x²)^5
=(x-1)^5
=(x-1)²(x-1)²(x-1)
=(x²-2x+1)(x²-2x+1)(x-1)
=(x-1-2x+1)(x-1-2x+1)(x-1)
=(-x)(-x)(x-1)
=x²(x-1)
=(x-1)(x-1)
=x²-2x+1
=x-1-2x+1
=-x
x^20=(x^10)²=x²
x^30=(x^10)^3=-x^3
原式=-x^3+x²-x
=-x(x²-x+1)
=0
解答完毕！
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