Biểu thức 3: "m" "x" plus "f" minus "m" "v" left brace, 1200 less than or equal to "x" less than or equal to 1500 , right bracemx+f−mv1200≤x≤1500
3
Biểu thức 4: "m" equals StartFraction, min left parenthesis, StartNestedFraction, "f" NestedOver 12 , EndNestedFraction minus 400 ninths , 1600 ninths , right parenthesis Over 50 , EndFractionm=minf12−4009,1600950