s^3+4s^2+3s+2
    s^3＋4s^2-3s＋2
    29.81261/x=1.008
    29.81261/x=1.008
    27.44372/x=1.008
    349.32/x=1.015
    （40-x）^0.75=0.363（x-29）
    （40-x）^0.75=0.397（x-29）
    0.9538x-4.0637=-2.2531x^2+6.9416x-7.9069
    30×69+75x+100(70-x)=86.2×100
    x+x*0.05=35343
    10000÷x+20000÷（x+50）=150
    0.5025/x=1.015
    0.04263/x=1.015
    0.04771/x=1.015
    0.15631/x=1.015
    （40-x）^0.75=0.397（x-29）
    100-(x+2)=60+66-5x
    0.0335/x=1.015
    0.22026/x=1.015

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