10x-5（20-x）≥90
    10（20-x）-5x≥90
    -4+a+5>=-1
    16m²+8-32m-12(16m²+1-8m)≤0
    0.5X-3>-14-2.5X
    6/1*X-1-1<2/1X
    4*(X-1)<2X-6
    5X-2>3
    x^3-2x^2-3x-3>0
    x+1/x>4.25
    4x x>8
    -3/x<1
    lnx-x＜0
    lnx-x＞0
    3x-1<5
    2sqrt(m^2+m)≥m
    2sqrt(m^2+m)≤m
    2sqrt(m^2+m)/m≤1
    2x²+x-1≥0
    900×［(1+x)^10-1］/x（1+x）^10>3000

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