X-9%X=160000
    sqrt(64-x^2)+sqrt(36-x^2)=10
    x^2-101×x+84=0
    x^2-4=0
    x^2-101x+84
    x+x*0.3=3880
    x÷20=（10-x）÷40
    x÷20=10-x÷40
    10000/x+28400/(x+50) = 150
    10000/x+18000/(x+50) = 150
    10000/x+18400/(x+50)=150
    （X-200-300）*(1-25%)-55=(X-200)*(1-25%)-55
    （1+x/4）^4-1=0.1025
    s^4+6s^2+8＝0
    X/1.048^5+X/1.048^4+X/1.048^3+X/1.048^2+X/1.048^1+X=1000+X
    X/1.048^5+X/1.048^4+X/1.048^3+X/1.048^2+X/1.048^1=1000
    78×（x－4）＝74×（x－2）
    5x^2+3x-5=21
    100/1.0404^2+100/1.0404^3+100/1.0404^4=X
    0.074*sin(x)/cos(x-5)+0.01*(1+sin(x)) =1

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