Expression 1: "y" Subscript, 1 , Baseline equals StartFraction, left parenthesis, 20 times floor left parenthesis, StartNestedFraction, "x" Subscript, 1 , Baseline NestedOver 1000 , EndNestedFraction , right parenthesis , right parenthesis Over "x" Subscript, 1 , Baseline , EndFractiony1=20·floorx11000x1