（4.156-y）*0.0003174*（1280000+100000*y）=0
    (X×0.85)+1700-X=17000
    （4.156-y）*0.001739*（88000+87044*y）=0
    76-800x+400x²=0
    (X÷0.85)+1700-X=17000
    （4.156-y）*0.003174*（1280000+100000*y）
    ((800-9213.5)+x)*0.75/30000=0.12
    (X÷0.85)=15300+X
    ((800-12168.93)+x)*0.75/30000=0.12
    （4.156-y）*0.0003174*（1280000+100000*y）
    ((800-12168.93)+x)*0.75/30000=0.05
    5213.15+(（800-12168.93）+x)*0.75=5634.18
    1267650600228229401496703205376X 4
    1267650600228229401496703205376 x4
    12a-a
    x(x+8)=65
    x(x-8)=65
    a*a+a=600
    16x=25
    60x²+120x-23940=0

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