999.99 (of 100 9) * 999.99 (of 100 9) + 99.99 (of 100 9) 999.99 (100 9 in total) * 999.99 (100 9 in total) + 199.99 (100 9 in total) How many zeros in all? Note: the last one is 1999... 9 (100 9S)

99 (total of 100 9) = k
K + 1 = 100000... 000 (100 zeros in total)
The original formula = k * k + (K + 1) + k
=（k+1）*（k+1）
=10000... 000 (200 zeros in total)

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