(370000*1.4-x)*(1.25*2*1.04)＞(370000*1.425-x)*(1.25*2)
    2x+5＞5x-1
    (2x^2-x+1)/2x+1＞0
    500-20x≧300
    (x+5)/2>10
    (2-3x)(2x+1)＞2
    25（1+1.5%）^8＜18（1+X）^8
    -⅓≤x
    （3-2x）-（5+3x）（x-1）²＞0
    x²-2x-2╱x²+x+1＞1 x²-2x-2╱x²+x+1＜2
    x²-2x-2╱x²+x+1＞1
    x²-2x-2╱x²+x+1＞1
    x^2<2506
    x^3-4x<0.1
    x^3-4x<0.2
    x^2-85x+3995<=0
    (1/2)^a<8
    （1/2）^a<8
    (X+2)(x-3)>0
    4^x+4^-x≤2^x+2^-x+7/4

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