-0.4X+0.1（25000-X）=2480
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=90.135
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=90.450
    （x-5.861）*200-0.1=2
    （x-5.861）*200-0.1=1.5
    (x－150)➗150=60％
    V=274.48+0+8.23+0.01V+9.61+0.0002V+23.39+0.0008V+0.0538V
    （274.48+0+8.23+0.01V+9.61）×8%
    ln(0.183*0.05/x+0.187)=4.757/0.183
    2400+(64-n)(90+1.5n)=8142
    (85)/(184+x)=0.2
    (85+x)/(184+x)=0.2
    3Q2-40Q+100=0
    （x-800）×0.8+800=1760
    30000/x+40000/(x+60)=350
    50000/x+60000/(x+60)=650
    50000/x+70000/(x+60)=650
    40000/x+60000/(x+60)=550
    30000/x+50000/(x+60)=450
    30000/x+30000/(x+60)=350

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