R*330/2+1.645*√(R+5)*√(3002+1802)+R*220/2+1.645*√(R+14)*300<6000
    R*330/2+1.645*√(R+5)*√(3002+1802)+R*220/2+1.645*√(R+14)*300<6000
    (61.2+0.18x)/(93+0.6x)
    61.2+0.18x/93+0.6x
    102+0.3x/155+x=0.6
    x2-3x≥0
    x^2-2x-1
    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

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