3x＾2-24x+40
    3x＾2-24x+40
    （42.309+x）×1.35＝75.418-x+42.309
    （42.309+x）×1.55＝75.418-x+42.309
    （42.309+x）×1.75＝75.418-x+42.309
    （42.309+x）×1.95＝75.418-x+42.309
    （42.309+x）×1.95＝76.418-x+42.309
    （42.309+x）×1.75＝76.418-x+42.309
    （42.309+x）×1.55＝76.418-x+42.309
    （42.309+x）×1.35＝76.418-x+42.309
    x*2.99=2.59
    0.6x+1.4（10-x）=12
    5/t2+2t-270=0
    xln(x/0.108)=0.03
    xln(x/0.108)=0.01
    xln(x/0.108)=0.02
    xln(x/0.108)=0.030
    m^2-3m=1.414×(m-3)
    -m+3-(m^2-4m+3)=1.414×(-m+3)
    2x=230+2÷16

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