x/(450+x)=0.15
    X/（100+X）=0.2
    x*e^x-3
    17.1x^2-203.1x-720.3=0
    x*exp(x)-1
    x*exp(-x)-1
    17.1x^2-159.40x-888.1=0
    -5.58x^2+183.0x-177.47=0
    -5.58x^2+183x+234.92=0
    26.05x^2-87.41x+261.41=0
    26.05x^2-87.41+x261.41=0
    26.05x^2-87.41+261.41=0
    -5.58x^2+183x+234.915=0
    5x=20
    7=(2*sqrt(2)-a)^2+(2*sqrt(2)-(2+sqrt(3))*a)^2
    100x²+300x+179=0
    100x²+120x+179=0
    25x²+75x-16=0
    7x²-34x-1196=0
    (10+x)(600-10x)=10000

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