170*a^2+24778*a-2080399＝0
    （x+1）*ln(x+1)
    tanx=x/6
    （20-x）（100+10x）=2240
    （y-750）（250-1/5y）=12000
    （y-750）（250-1/5）=12000
    （1100-50x）（30+10x）=12000
    (19-x)(300+30x)=6300
    (19-x)(3000+30x)=6300
    x^1.5-x^2.5/150=51.81
    x^3－x^2－x＋1＝0
    x^1.5-x^2.5/150=42.46
    x^1.5=4530/(106.7-106.7x/30)
    (0.1*a+1)*e^(0.1*a)=2
    x-（0.57X+12000+12000+4000）=0
    2x^2+6=7x
    2x^2-5x+3=0
    x^2-5x-6=0
    x^2-2x+1=0
    x^3+3x^2+3x

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