计算:99.9×99...9+199...9 都是N个

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计算:99.9×99...9+199...9都是N个计算:99.9×99...9+199...9都是N个计算:99.9×99...9+199...9都是N个99.9×99...9+199...9=(9

计算:99.9×99...9+199...9 都是N个
计算:99.9×99...9+199...9 都是N个

计算:99.9×99...9+199...9 都是N个
99.9×99...9+199...9
=(99…9)²+2*99…9+1
=(99…9+1)²
=10^(2n)