0.71567cos(x)+0.97765*sin(x)*sin(x/2)-0.23855 = 0
    -x^3+x^2+x-5=0
    log(10,40)=6.354-5567:x-0.5log(10,x)
    log(10,x)=4.114-4367/537.6
    y(y+1)（y+2）（y+3）=42806.4
    log(10,40)=6.354-5567/x-0.5log(10,x)
    log(10,40)=5.354-5567/x-0.5log(10,x)
    Sqrt((2-0)^2+(-3+sqrt(5))^2)
    1/d+1/（d+2）+1/（d+2）＝0
    Sqrt((2-0)^2+(-3+sqrt(5))^2)
    (x+1)(x+4)=(x+2)(x+3)
    s^3+6s^2+18s+20=0
    √3xx+248=0.99（400+x）
    sqrt3(4-x)=x+4
    (3x+x^2)/x
    12x=15(90-x)
    -x-4/x
    (3x+x²)/x
    (3x+x)/x
    −3/2x−3x=5/2−1

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