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-1
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-1267650600228229401496703205376\times 0.5^{100}
Calculate 2 to the power of 100 and get 1267650600228229401496703205376.
-1267650600228229401496703205376\times 0.0000000000000000000000000000007888609052210118054117285652827862296732064351090230047702789306640625
Calculate 0.5 to the power of 100 and get 0.0000000000000000000000000000007888609052210118054117285652827862296732064351090230047702789306640625.
-1
Multiply -1267650600228229401496703205376 and 0.0000000000000000000000000000007888609052210118054117285652827862296732064351090230047702789306640625 to get -1.
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