2-0,9999999999999999=

The expression \(2 - 0.9999999999999999\) equals \(1.0000000000000001\), which is mathematically very close to \(1\). In practical terms, \(0.9999999999999999\) can be thought of as being equal to \(1\) since it is an infinitely repeating decimal. Therefore, the result can be approximated as \(1\).