7-2 = 1/72 = 1/49
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0.1 = 10^-1
-3/7 < -1/7
You don't do anything with it. Since it has an "equals" in it, it's an equation. That means it makes a statement, and in this particular case, we know right away that the statement is false. 5 + 3 + 2 does not equal 151,022. It equals 10 .
It certainly has a meaning. It is only meaningless if you consider powers as repeated multiplication; but the "extended" definition, for negative and fractional exponents, makes a lot of sense, and it is regularly used in math and science.
Because it thinks that the negative sign is actually another operation to do and because of the order of operations, the calculator squares it first then makes it negative. To fix it, type it in like this (-3)2