-345000+265000÷（1+x）+150000÷（1+x）^(2)+98000÷（1+x）^(3)=0
    x^2+294787.70-4212x=0
    x^2+446214.66-4212x=0
    x^2+380273.42-4212x=0
    50/12
    2(x-4)-3<1-3(x-2）
    x^2+309734.03-4212x=0
    x^2+140375.03-4212x=0
    （8-8/5t）/(6-11/5t)=t/(8-8/5t)
    x^(2)-16+17=0
    4x*x*x-10x*x+4x=0
    （50-x）^0.75=0.4494*(x-36)
    （50-x）^0.75=0.397*(x-39)
    (sinx)^2/x^2=50.84
    (50-x)^0.75=0.387*(x-39)
    sinx=1
    15-(7+5x)≤2x+(5-3x)
    [（2-z）*（2-z）+1]+[1+（z+3√5/5）*（z+3√5/5）]=（2+3√5/5）*（2+3√5/5）
    2(3x-1)-3(4x+5)≤x-4(x-7)
    2(x-1)-x>3(x-1)-3x+5

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