400a+300(15-a)≤5200 (5/2)a+2a≥32
    400a+300(15-a)≤5200 5/2a+2a≥32
    -400a+300(15-a)≤5200 5/2a+2a≥32
    -400a+300(16-a)≤ 5/2a+2a≥32
    x-3<=4/(x-3)
    8/(abs(x)+2)-2<=0
    x-3<=4/(x-3)
    -4x-1<5-x
    (-4)*x-1<-(x)+5
    -4x<-x+6
    -4x-1<-x+5
    1-3x/4>7
    3(x+4)<=-15
    36+24k>0
    (-k)^2-4k>0
    (-k)^2-36>0
    4-4k>0
    7500/(a+74.88)+10000/(a+62.4)+30000/(a+10.4)小于143
    7500/(a+74.88)+10000/(a+62.4)+30000/(a+10.4)＞143
    10+（3n+7)(n+1)<=2048

Home page << page52 page53 page54 page55 page56 ... ... page67page page68page page69page page70page page71page >> Last page 1275 pages in total