用数学归纳法证明 X^2n-1+y^2n-1能被X+Y整除,从假设n=k成立到n=k+1/成立时,被整除式应为一般从n=k到n=k+1是被整除式是怎么计算的啊A:X^2k+3 + Y^2k+3B:X^2k+2 + Y^2k+2C:X^2k+1 + Y^2k+1D:X^2k + Y^2k
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