（x-40）×[200-2x]=68
    （x-40）×[200-2x]=88
    1/3^x
    x+2x+14x=25500
    x-10/10-1/10=1.1x-12/12
    1.1x-12/12
    x-10/10
    x-10/10-10%=1.1x-12/12
    2x-（-1）=5
    3x^2-16x+14=0
    a/2.5(1+log(10,(a+3)/a))=(38-a)*(44+a)/284-5a
    3x^2-16x+14=0
    cosx=0.895347/0.9
    (x/0.9)^2+((1.2-x)/3)^2=1
    3x^2-28x+45=0
    74=100/x^5+7.7/x+7.7/x^2+7.7/x^3+7.7/x^4+7.7/x^5
    X－1/2(X＋5)＝5
    3x^2-28x+45=0
    1/6+(1/60+1/90)X＝1
    200/9X＝100

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