It could be: 1234567890 = 1
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0.0001
90 + (1 * 8) + (2 * 3) - 7 + 4 + 5 - 6
To write the number 1 using all ten digits (0-9), you can use the following expression: 1 + 0! + 2 - 3 + 4 + 5 - 6 * 7 + 8 - 9 = 1. This equation utilizes addition, subtraction, multiplication, and factorial operations to combine all the digits from 0 to 9 to ultimately equal 1.
0.0125
The largest whole number that uses all ten digits just once is 9876543210.