100*x*0.86-(100-x)*100>0
    6÷（x+2）＞3
    2021n>2020*2022n
    5/3x²－100x＋1500 ≤0
    e^x-2x>=cosx
    5/3x－100x＋1500≤0
    3x²-68x+105＜0
    2^n-2>=50
    4x^2-12x+(28-(2*(3)^(0.5)))>0
    4x^2-12x+28-2*(3)^(0.5)=<0
    4x^2-12x+28-2*(3)^(0.5)>0
    v/4+(v^2)/360>38
    0.25v+(v^2)/360>38
    (80000-2000x)*(2.5+0.1x)>=200000
    [(39-3x)/2]*x>=45
    abs(5-x)<=3
    x²+4-4x＜0
    (6√3x^2)-4*(9x^2+3)*(3x^2-1)＞0
    (5－x)(3+x)≤0
    [(2x)/(1+x)]>0

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