xx+x-6=0
    xx+7x+12=0
    6000=(x-4)(-1000x+9000)
    (x-5)(-1000x+9000)(1.2)=(x-4)(-1000x+9000)
    xx-3x+2=0
    xx-x=240
    60x-xx=864
    xx+2x-9=0
    3xx+6x-4=0
    8x×x-60x+72=0
    20-2.5（x-2）-2.4（3-0.5x）=4.7-（3-x）
    43x-41x=168
    X-（X/1.13*0.13）=3849.56
    72x-x^2=324
    x（72-x)/3=324
    t^2-24t-32
    3^(2x-1)+3^(x-1)=2
    x²−1400x+122500=0
    （31958-X）/X=0.7
    （1159-X）/X=0.55

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