（x+1）(x-2)>(x+1)(-x+6)
    -37500+5700/(1+r)+12900/(1+r)^2+16300/(1+r)^3+27500/(1+r)^4＜-37500+17300/(1+r)+16200/(1+r)^2+13800/(1+r)^3+7600/(1+r)^4=0
    x2-5x+10＜0
    x*(1+x)^33>0.567
    4
    12<2-a<13
    2x<3(x-3)+1
    x>3 x<2
    x-4<(x-8)/3
    4(x+1)<7x+13
    ((x-1/2)^2+7/4)×(x+4)(x-3)≥0
    2a-3>a+1
    6x^2-5x-1<0
    x^2>4
    1245.4 * ( x +1 ) < x ^ 2 * ( 8 * x - 1 ) ^ 2
    1245.4 * ( x+0.57 ) < x ^ 2 * ( 8 * x - 1 ) ^ 2
    1245.4 * ( x+1.2 ) < x ^ 2 * ( 8 * x - 1 ) ^ 2
    1245.4 * ( x - 0.57 ) < x ^ 2 * ( 8 * x - 1 ) ^ 2
    1245.4 * ( x - 1 ) < x ^ 2 * ( 8 * x - 1 ) ^ 2
    1245.4(x-1.2)

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