x+3×x+3^2×x+3^3×x+3^4×x=100
    Lgx＝4.5684
    x+3×x+3^2×x+3^3×x+3^4×x+3^5×x+3^6×x=100
    a^2-2200a+2420000=0
    x+3×x+3^2×x+3^3×x+3^4×x+3^5×x=100
    x+3×x+3^2×x+3^3×x+3^4×x+3^5×x+3^6×x+3^7×x=100
    266.9-1/2*20*x^(2)*0.42*2-20*0.42*x*2=0
    x+3×x+3^2×x+3^3×x+3^4×x+3^5×x+3^6×x+3^7×x+3^8×x=100
    3^5×x+3^6×x+3^7×x+3^8×x+3^9×x=100
    3×x+3^2×x+3^3×x+3^4×x+3^5×x+3^6×x+3^7×x+3^8×x+3^9×x=100
    x+3×x+3^2×x+3^3×x+3^4×x+3^5×x+3^6×x+3^7×x+3^8×x+3^9×x=100
    r^2+6r+13=0
    -600d+192000=90×3.14d^3
    600d-192000=90×3.14d^3
    x*x*x*x=116.16
    600d+192000=35×3.14d^3
    X/2+x=300
    3x*x-14x+10=0
    Lg4.69222
    （50-x/10）*（160+x） = 9450

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