Expression 2: StartFraction, floor left parenthesis, "x" times "l" plus 0.5 , right parenthesis Over "l" , EndFraction left brace, 0 less than or equal to "x" less than or equal to 1 , right bracefloorx·l+0.5l0≤x≤1
2
Expression 3: max left parenthesis, 0 , StartFraction, ceil left parenthesis, "x" times "l" , right parenthesis minus 1 Over "l" minus 1 , EndFraction , right parenthesis left brace, 0 less than or equal to "x" less than or equal to 1 , right bracemax0,ceilx·l−1l−10≤x≤1