480+200(21-a)>3600
    180(x-2)<600
    x∧2+2x-4<0
    0.833753<(4.93+x)/(2.33+x)<1.199396
    0.833753<(2.33+x)/(3.87+x)<1.199396
    (x-(√3)/4)^2≥((√3)/4)^2
    (x-1.5)^2≥0.5^2
    1/(x-6.371*10^6)-1/x>5.965/6.371/4/10^12
    20456
    (x-2)*(x+1)<0
    x^2-2x-3>0
    3*x>-5
    50b+40(30-b)≥1400
    200a+170(30-a)≤5400
    abs(x-2)
    2[x-3(x-2)]>6(2/3-3x)
    10(x-3)-4<2(x-1)
    x-122/x>5
    21x^2-6x+5>0
    x/1.05*0.05=1449.02

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