0<(1-60/x)^2<1
    （x）=x^2+1/x
    0<1-60/x<1
    （x）=x/x^2+1
    （2x-1）/（x-1）≤0
    （2x-1）/（x-1）
    7x+4(10-x)<=50
    123-(3x-5)(2x-8)＞45
    1.2-(3x-2)(6x+8)(3+x)≥(x-2)(6+x)-0.5
    3x+6×5＞54
    8<7
    3>4-e
    e4>0
    e4=9
    58x>4
    y≥5
    324x567=345
    x/(x+1600)*100%=20%
    275R+758.13*√(10+R)<6000
    2*x^2-3*x+1>0

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