(120-x)(64+1.6x)=8800
    450X-（310.02+240X）-（450X×13%-15X-30.4）×12%=0
    x^3+3x^2+2x+1=0
    10=0.05x+0.005x^2
    12=0.1x+0.01x^2
    （0.525W－180）/130＝（0.525W－186）/80
    （0.525W－180）/130＝（0.525W－186）/80
    x²+6x=48
    arctanx+0.8x=π
    tan0.8x+x=0
    800+60x-2x^2＝1200
    160x-2x^2＝3150
    40x-2x^2＝3150
    x^4-9x^2+16=0
    121x^2+33x-154＝0
    3x^4+10x^3+21x^2+24x-16=0
    （x×0.0045）×36+x=94104
    （x×0.00383）+x=94104
    44x-2x^2＝192
    120m^2+10m-60=0

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