(10000-10000*x)*0.14>x*10000
    －4X≥－7
    (10000-x)*0.14>x
    －4X>－7
    800*x*x--6.667*3.917*(1116.5-x)=0
    0.82×7＋0.77x
    2X>2
    800*x*x--6.667*3917*(1116.5-x)=0
    100 = 1.2^x
    sin2x+cos3x=0
    80*x*x-71*(x-12)*(x-12)-6.667*3917*(111.65-x)=0
    800*x*x-710*(x-12)*(x-12)-6.667*3917*(1116.5-x)=0
    4x^(2)-3x＝52
    5x^(2)-2x＝4
    x^3-7*x^2+15*x-9=0
    84*x＋100*（1-x）＝90
    (3*X+20)*X/2=18.35
    －4y≥5
    3/4x=21
    3t^2+2t=120

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