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draw the graph of f(x)=x+[x], [.] denote...

draw the graph of f(x)=x+[x], [.] denotes greatest integer function.

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`f(x)= x[x]= {{:(......,,),(......,,),(-2x",",,x in [-2, -1)),(-x",",,x in [-1, 0)), (0",",, x in [0, 1)), (x",",, x in [1, 2)), (2x",",, x in [2, 3)), (......,,),(......,,):}`
The graph of the function is as shown in the following figure
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