2-1 + 0*(3+4+5+6+7+8+9) is one possible way.
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It could be: 1234567890 = 1
22, 28, 82 and 88.
874321 is the largest number made from all these digits.
90 + (1 * 8) + (2 * 3) - 7 + 4 + 5 - 6
You would need infinitely many digits to write all numbers. However, to write all whole number (integers) you would need 4243.