70.52*(1458-80)=62682+33408.52+3820+2.2*-80+0.5*-80*18.67+0.5*-80*19.47+7Y
    64.7*(1458+X)=53135+36543.88+7X
    63.08*(1458+55+Y)=62682+33408.52+3820+2.2*55+0.5*55*18.67+0.5*55*19.47+7Y
    59.51*(1458+X)=53135+36543.88+7X
    x^2-6x+4=0
    2x*3x
    X÷5=X-32
    （4∧x＋2）∧-1
    (x^3-x^2+2*x+1)/(1-x)^2=0
    x^5-4x^4-x^2-2=0
    209（x+5）=260x
    x-（0.096x）=273720
    X=(X+865707.25)*1.5%
    x/30+(35-x)/40=1
    x*e^(-x)=1/4
    (x/20)+(x/30)+(x/42)=3
    s^3+6s^2+8s+4=0
    X=(X+874141)*1.5%
    x²+x-1
    625÷(x+5)=500÷x

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