-3x^4-36x^3-188x^2-420x-300
    -（1/30）xx+8/3x=8
    -20a^2+840a+5000=0
    x^2+x+1
    （x-60) (-x+100)=(x-75)[-2(x-25)+150]
    sin(x)=3
    (15-x)(400+5x)=4250
    lg(x²+12)=4lg(x)
    y^2+y(4-y^2)^1/2+2(1-2y^2)^1/2-1
    X/(X+5)=87.5%
    x-10=72-x
    100*y*y-156y-87=0
    96-48t+6t^2-150t^3+32.5t^4=16
    （x-1）＾8=-1
    x^2-17.9 x+79.8=0
    (X-X/1.09*0.03)*0.02=36331.75
    (X-X/1.09*0.03)*0.02=85247.35
    X-（X*25%）=2556
    0.15x=16.5
    x/660000+(1350000+x*10)/24933327=1

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