5*t∧2+3t+3.8＝0
    lnx=3.48
    x＾ln(3)+x＾ln(4)=x＾ln(5)
    （x+2）^2＝4（x－2/3）
    （x+2）^2＝1/4（x－2/3）
    ln（x-2）/x
    0=1*x*(1-5%)-(140*1-50)
    X-（500+600+0.3X+0.5X*0.2）=0.7X
    （400+5x）（40-25-x）=4250
    【x-2】^=0
    400（x+1）（x+5）=4250
    2-【x】=8
    X-（500+600+0.3X+0.5X*0.2）=2000
    X-（500+600+0.3X+0.5X*0.2）=0
    256（x+1）^2=400
    x=0.0188*(51/(0.0147/(3.14*x^2)))^0.5
    720x=800(x-3)+1200
    1/x/x
    0.1625x+10.5625＝0.0216x^2
    12x^2-80x+96=0

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