(460+2x)/(780+3x)=60%
    (460+x)/(780+2x)=60%
    (460+x)/(780+x)=60%
    x*50-300-80*50-5*50=0
    12➗0.5x＝6
    tan(x)=2*sin(60-x)
    2xlnx-x+1=0
    212700(1+x)^15=377500
    212700x^15=377500
    xx-15x+60=4
    x/0.95-x=95842
    x^6+3x^4+3x^2-99=0
    55/(1+i)+72/(1+i)^2-100=0
    3x+4
    x^6+3x^4+3x^2-15=0
     0.5＾1/x
    （28+x）/（71+x）＝0.6
    （28+x）/（71+x）＝0.7
    x÷260=x÷360＋1
    x÷260=x÷360+1

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