x(30-2x)≥100
    lg3
    X-[(X÷1.06)*0.06+(X÷1.06)*0.06*0.12+（X÷1.06）*0.001]=405064.54
    x+(x*0.5)=1251.28
    1≤1+x∧2≤3
    5-x＞3x-3
    4m^2-8*m+3<0
    -2(x-10)^2+200≥128
    (3-2x)+(3-x)>=9
    0.5x*x-2x+16≥22
    -2x*x+60x+2000≥2400
    （658+1.14x）*0.5/0.63＞（1024+1.14x）*0.1/1.2
    5×(658+1.14x-1300)/0.63＞(1024+1.14x-1300)/1.2
    2x＜6
    15-9/(6-x)＞2.5
    (6-x)(x-1.2) >60
    1000-(6-3x)(2x-1.2)＞600
    24453085907.57×2×1568.1 = 19.08×(599.6X-1568.1)^3
    x^2<84/15
    1005021830801.29×2×1568.1=4031.175×(599.6X-1568.1)^3

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