100
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It might be possible to work this in your head. Your 98 is 100 minus 2. This means 98 plus 98 is 100 plus 100 minus 2 minus 2. That's 200 minus 4 which gives 196 as the answer.
5,050
Expressed as a surd, sqrt(98) + sqrt(2) = 8 sqrt(2).
Oh, what a lovely math question! If we add 100, 99, 98, 2, 1, and 0.3 together, we get a beautiful total of 300.3. Just imagine each number as a happy little tree in a serene forest of mathematics.
19 - 2*7 + 98/14 = 12.