x=290621.707017143+（10.24%/3.03）x
    8x-24/25x-40=1/4
    (x-117.602)*10-0.6-0.6=2
    18/x=12÷16
    4:10=x
    8/20=4:x
    a
    （x-25+10）*0.6/（（x-25+10）*0.6+（180-x+15）*1.3）=24.6%
    （x-25+10）*0.6/（（x-25+10）*0.6+（180-x+10）*1.3）=24.6%
    4*x^3+15*x^2+16*x+6=0
    -0.22x+106=18x+0.00044
    -7=-15624x
    -7=18*-868+x
    -0.22x+106=18x+2232
    3x^2-6x=1
    x^(x+1)=(x+1)^x
    x^2-x=1
    -75000+(44000/(1+x))+(44000/((1+x)^2))+(44000/((1+x)^3))=0
    4x^2+6x-14=0
    100=0.1×x/（1+x）

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