2x十10一x＝16
    (53-x)/x=0.309
    X/87-(97-X)/100=0.73
    (x+225)/(9x+225) = 4x/(25x+2025)
    x+225/9x+225=4x/25x+2025
    12-12x+4x^2=9
    (20+x)*x=476
    2x-1=0.6（3x+4）
    1.5×5x=0
    x^3+3x^2+2x+1=0
    (186+270)/31*x+248/31*(x+15)+109/31(x+30)=1372
    1.5×(5x+8)
    3/2=X+25/X+5
    x^7-x^6-55x^5+110x^4+428x^3-491x^2-441x+44=0
    670.3×（1+x）^14=785.3
    394.1×（1+x）^14=572.9
    (32+x)*3-(32-x)*4=10
    0.78x²+581.81x-13.21=0
    0.78x²+581.81x-13.14=0
    0.78x²+59x-13.14=0

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