200x-（-100x+1000）=300 -100x+1000-200x=300
    [-0.0037x+308.51-(-0.000003(x^3)+0.004450(x^2)-2.126399x+624.408850)](x-300)=((-0.000003(x^3)+0.004450(x^2)-2.126399x+624.408850)-(0.0034x+284.84))(550-x)
    -100x+1000=200x
    100x+1000=200x
    2388*0.0283*（50.5-x）^0.75=55.98*1.448*0.4878*（x-39）
    [-0.0037x+308.51-(-0.000003x^3+0.004450x^2-2.126399x+624.408850)](x-300)=((-0.000003x^3+0.004450x^2-2.126399x+624.408850)-(0.0034x+284.84))(550-x)
    2x=6x-2
    y=-7/48（1.75-4）（1.75-4）+3
    2/3=a（1.75-4）（1.75-4）+3
    2/3=a（4*4）+3
    cosarcsinx
    0.0000001*x^3-0.0030010*x^2+27.2348652*x-82259.5691160
    x^2+81=(15-x)^2
    x=3/7*(2x+9)
    x=3/7*(2x+9)
    x(2x+9)=3/7
    1.82÷（1+0.01x）=1.7
    2732.231×0.028×（40-x）^0.75 = 62.256×0.887×0.488×（x-30）
    x^7+x^4+4x^2+19x-10=0
    2732.231×0.028×（40-x）^0.75 = 87.923×0.887×0.488×（x-30）

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