4.8554=（（30.56*0.847（x+0.1））/（1+0.847（x+0.1））*（（100-8.28-1.4）/100）*（1/(1+0.31*1.4）+（（2.26（x+0.1））/（1.3*0.101325））
    -1/3x∧3＋x∧2＋x＝5/6
    n（-n+3n+1）＝2
    n（-n+3n+1）＝2
    x－(x*0.1%)＝5000
    x/(231.2＋x)＝0.01
    x/(231.2＋x)＝0.03
    （x-3）(x+47)=2975
    x(x-1)=56
    16x+16=12x+12
    （38+2x）(23+2x)=1000
    x*1.07=0.884
    X/111-(100-X)/1000=0.273
    X/111-(100-X)/1000=0.00273
    x/460＝x/520+5000/460
    x^2=200
    x^7-16*x^6+101*x^5-322*x^4+550*x^3-486*x^2+188*x-16=0
    2*x^5-21*x^4+79*x^3-135*x^2+107*x-32=0
    (x-1)*(x-2)*(x-4)-(x-2)*(x-3)-(x-1)*(x-4)=0
    (x-1)*(x-2)*(x-4)-(x-2)*(x-3)-(x-1)*(x-4)

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