x/60-x/70=1
    （140-100-a）（300-2a）=1200
    4003*（5256-x）=378*x
    (30+x)/(6x)=(6x)/(30－3x)
    X-X/1.01*0.01-(X-X/1.01*0.01)*0.043=2900000
    23.1x-190=0
    7x²－30x+900=0
    X-X/1.01*0.01-(X-X/1.01*0.01)*0.043=2200
    X-X/1.01*0.01-(X-X/1.01*0.01)*0.043=18058
    X-X/1.01*0.01-(X-X/1.01*0.01)*0.043=386090
    X-X/1.01*0.01-(X-X/1.01*0.01)*0.043=1206773
    X-X/1.01*0.01-(X-X/1.01*0.01)*0.043=1402017.9
    1/x+1/(1+x)+1/(3+x)=1/(2+x)
    e^x=1.01
    lnx=－x
    （140-100-a）（300-2a）=1200
    20x+180=24x+72
    s^2+2s+1＝0
    4s^2+3s+2＝0
    3x＾2+22x+10=0

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