720*（0.5a+400）÷560+50a÷60=1.5a+400
    x^2+x-600=0
    1981a+535*（7610-a）=7610*912
    -13/36x^2+23/4x-175/18=8
    √2x=1
    -13/36x^2+23/4x-175/18=8
    8096x^2-89100x+81000=0
    x-1/x
    d*d*d+40*d*d+400*d+2000=0
    1/(d+5)=1/(d+2)+1/(d+3)+1/d
    2s^3+5s^2+4s+0.75＝0
    3k^2+2k+3=0
    k^2=1
    63k^2+2k+63=0
    x*5+6=10
    5x^2+16x+8=0
    - 0.5(x-2)^2+2 = -1
    0.5(x-2)^2+2=-1
    9990x-30000=12000
    t^2+16^2=(16-2t)^2+64+4t^2+(8-t)^2

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