式5: negative "x" cubed plus 81 "x" squared minus 2180 "x" plus 19495 left brace, 25 less than "x" less than 30 , right brace−x3+81x2−2180x+1949525<x<30
5
式6: "x" to the 4th power minus 135 "x" cubed plus 6824 "x" squared minus 153060 "x" plus 1285195 left brace, 30 less than "x" less than 36 , right bracex4−135x3+6824x2−153060x+128519530<x<36
6
式7: "x" squared minus 76 "x" plus 1435 left brace, 36 less than "x" less than 40 , right bracex2−76x+143536<x<40
7
式8: "y" equals negative 5 left brace, 40 less than "x" less than 50 , right bracey=−540<x<50