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About math homework in senior one.
Let the coordinate of the starting point be x, then

The position coordinate after the first step is x- 1.

The position coordinate after the second step is x+ 1.

The position coordinate after the third step is x-2.

The position coordinate after the fourth step is x+2.

……

The coordinate position after step 100 is x+50.

X+50= 19.94。

So c=-30.06

So the initial position K0 of the electronic flea is -30.06.