2500x+(40-x)2800≤105700
    2500x+(40-x)2800≤10570
    （10-C）/10 ＞0.55
    （S-5.3）/S ＞0.55
    2x-√5x＞3
    （S-7）/S ＞0.55
    （S-5）/S ＞0.55
    （S-4）/S ＞0.55
    （S-1.8）/S ＞0.55
    a^3-6*a^2+12*a>9
    1-(a-2)^3>0
    1200x+3500(x-1)<67000
    1200x+3500(x-1)<6700
    23Y^2 -78>0
    x/70+(100-x)/50≤10
    ln ( e ( ( 3 , 7 ^( -9) ) / x ) - 1 ) <1 / x
    ln(exp((3,7^-9)/x)-1)<1/x
    ln(e(1/x))<1/x
     5x+38-6(x-1)<1
    5x+38-6(x-1)<5 5x+38-6(x-1)<1 5x+38-6(x-1)<1

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