x÷2-1＜0
    3（x＋1）≥x-1
    862+587n+(214n+22n^2)*(214n+7.3n^2)/(428+44n)+(13.6+n)*41+(8.9+n)*319.5-1.2[3628+1057n+(285n+3.7n^2)*(285n+1.23n^2)/(285+3.7n)]>=0
    1448+837n+(240n+25n^2)*(240n+17n^2)/(480+50n)+(13.4+n)*35.8+(9.7+n)*319.5-1.2[4496+1212n+(214n+3.6n^2)*(214n+1.2n^2)/(214+7.3n)]>=0
    862+587n+(213.6n+22n^2)*(213.6n+22n^2)/(427+22n)+(1.5+n)*41.3+(13.7+n)*319.5-1.2[3628+1057n+(285n+3.7n^2)*(285n+1.24n^2)/(285+3.73n)]>=0
    1449+837n+(25n^2+240n)*(50n^2+240n)/(480+51n)+35.8*(14.4+n)+325*(11.1+n)-1.2[4496+1211n+(214n+3.6n^2)*(214n+7.3n^2)/(428+7.3n)] >= 0
    1449+837n+(25n^2+240n)*(50n^2+240n)/(480+51n)+35.8*(13.6+n)+325*(11.1+n)-1.2[4496+1211n+(214n+3.6n^2)*(214n+7.3n^2)/(428+7.3n)] >= 0
    1448.5+837n+(25n^2+240n)*(50n^2+240n)/(480+51n)+35.8*(13.6+n)+325*(9+n)-1.2[4496+1211n+(214n+3.6n^2)*(214n+7.3n^2)/(428+7.3n)] >= 0
    542.9+382n+(18n^2+153n)*(38n^2+153n)/(306+38n)+47*(13.6+n)+322*(9+n)-1.2[3858+1011n+(199n+4.5n^2)*(199n+3n^2)/(400+9n)] >= 0
    693.7+513.8n+(20n^2+259.3n)*(40n^2+259.3n)/(518.6+40n)+40.6*(14+n)+322*(9.7+n)-1.2[755.2+1552+891n+1686+(186n+4n^2)*(186n+2.6n^2)/(372+16n)] >= 0
    693.7+513.8n+(20n^2+259.3)*(40n^2+259.3n)/(518.6+40n)+40.6*(14+n)+322*(9.7+n)-1.2[755.2+1552+891n+1686+(186n+4n^2)*(186n+2.6n^2)/(372+16n)]>=0
    2(2x-1)-3≤6 5x-1<3x+3
    3(2x-1)-3≤6 5x-1<3x+3
    -3-2x＞0
    2X-3＞0
    3-2X＞0
    -35.7+80lgx>6.5
    240x≥2x-(5-3.0005x)26
    450x+150*(600*15-600x)≥1600
    450x*100+650*(15-x)*150≥1600

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