X-3/X>2
    1200000+450x≤1000000+500x
    1200000+450x≤1000000×500x
    x－50-(100＋x)×1%≥10
    0x>1
    0.5 * ( ( 5 - k ) - sqrt ( ( k - 3 ) * ( k - 3 ) + 20 ) ) >0
    0.5((5-k)-sqrt((k-3)(k-3)+20)<3
    1 / 2 * ( ( 5 - k ) - sqrt ( ( k - 3 ) ^ 2 + 20 ) )>3
    1/2((5-k)-sqrt((k-3)^2+20)<3
    1/2((5-k)+sqrt((k-3)^2+10)>3
    1/2（-（k-5）-(（k-5）^2-4(1-k))^(1/2))>0
    x-50-（100+x）×1%≥10
    Ln x/2大于2
    ln x>0
    -2x+1<7
    3X+4>5
    3x+4>5
    X∧2-2X-4＜0
    5x+1
    5x+20<0

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