x^3-15x^2+69x-150
    0.17*X+X=400
    7x^2-10x-72=0
    2145x^(2)-1930500x+148293450＝0
    0.0592*12500X÷（0.0726*（1+12500X））=4200X÷（1+4200X）
    0.0592*12500A÷（0.0726*（1+12500A））=4200A÷（1+4200A）
    0.0004x^6+0.05x^4+x^2-900=0
    0.0004x^6+0.05x^4+x^2-30=0
    3Q^2-28Q-196=0
    -1400x+80x^2=3600
    x+6=(80-x)-18
    （1920-96x/2x）+20x=200
    x^(2)-0.9x-8.5=0
    x*x-0.9x-8.5=0
    x-6=(80-x)-18
    x*x-0.9x-8.5x=0
    (x-18)^3+1458-243*(x-18)=0
    x^2=1921.74*x+1921.74*2347.9
    223.04×8.75+565.32×3.75-0.002×9.66
    223.04+565.32=0.002+6.97t^2+14.44t

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