Mathematics
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    sqrt(x)-2x^2>2
    x-5<(x-8)/3
    1-(1-1/210)^n<1/10
    1+X/X>-1
    1+X/X<1
    1>x+1/x>-1
    250a+210×(30-a)≤5400
    3*(n-2)-1/2*(n-2)*3-1/2*1*(n-3)-1/2*3*1小于等于3
    x^2-47x+388≥48
    -30x∧2+3300x-8400≥6480
    -30xx+3300x-8400≥6480
    -30x2+3300x-8400≥6480
    (21+d)×(21+4d)<(21+11d)
    1102.13-227.1×(1.32+0.7/2+x )(0.52+2x )≤0.7×1×1570×[2×(1.32+0.7/2+x/2 )+(0.52+x )]×x
    1102.13-227.1×(1.32+0.7/2+x )(0.52+2x )≤0.7×1×1570×[2×(1.32+0.7/2+x )+(0.52+2x )]×x
    1.1×2955.03×10^6≤18.4×2000x(1450—x×0.5)
    1.1×2955.03×106≤18.4×2000x(1450—x×0.5)
    2(x-2)≤2-x (x+2)/2>(x+3)/3
    2(x-2)≤2-x
    6x<=x+25

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