表达式1: "f" left parenthesis, "x" , right parenthesis equals left brace, negative 40 less than "x" less than 40 : abs left parenthesis, 1 half abs left parenthesis, "x" , right parenthesis minus 10 , right parenthesis , right bracefx=−40<x<40:abs12absx−10
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表达式2: "g" left parenthesis, "x" , right parenthesis equals round left parenthesis, "f" left parenthesis, "x" minus 1 , right parenthesis , right parenthesisgx=roundfx−1
