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问题: 数学高手来!!

1.(a+1)*(a-1)*(a^2次+1)*(a^4次+1)*(a^8次+1)-a^16次。
2.(x-y+z)*(-x+y+z)=[z+( )]*[ ]=z^2-( )^2

解答:

1)=(a^2-1)(a^2+1)(a^4+1)(a^8+1)-a^16
=a^16-1-a^16
=-1

2)=[z+(x-y)]*[z-(x-y)]
=z^2-(x-y)^2