60x+100(50-x)≤4200
    n+2<=242/(3n+3)<=n+4
    1400x-x^(2)-71648≥0
    x^(2)-4x+4≤0
    394.77＝x*0.894
    lna/1>a－1
    189770238939
    （1+x）÷1-x=10
    1314520
    10：500=100：X
    2＋x +1/8>3-（x -1）/4 1＋2x /3<=x-1
    X+X*9%=35
    X+X*9%=1150
    X+X*9%=1710
    X+X*9%=645
    X+X*9%=765
    X+X*9%=230
    X+X*9%=84
    X+X*9%=550
    X+X*9%=460

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