x^4-16x^3+92x^2-227x+206=0
    8x^3-96x^2+368x-452=0
    36x^2-288x+552=0
    96x-384=0
    2-a=-2a-8
    x^2=x+3
    25*x*x-32*x+7=0
    8.99x^3+111.7x^2-2450.67=0
    8.99x^3+111.7x^2-2473.8=0
    10.34x^3+82.67x^2-682.98=0
    66=65x+xx
    lnx/x^2
    24x^2-20x+3=0
    （sinx+x^3）÷x^2
    a×0.6=30.9
    a×0.6=22.6
    a×0.6=13.6
    a×0.6=10.9
    a×0.6=9.9
    20.3×25.4÷x＝20.3×15.2÷120

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