y1
    y1
    sin(47.6+a) = sin(47.6)*e(-a/0.07/3.14)
    lnx=（x+1）/（x-1）
    （x-1）^2=0.067*(x+2)^2
    sin(17.6+a)=sin(17.6)*e(-a/0.07/3.14)
    5x=1.6+x
    6*x^3-15*x^2+10=0
    5(x-8)=3x
    (3.6+x)÷0.25=20.16
    2x-3.5×6=75+25
    x^(2)-5x-6=0
    sin(x)=e^x
    1.7=x*(2.5*ln(x*0.05/1.006*1000000)+1.75)
    -250-(400/(1+x))+(200/(1+x)^2)+(300/(1+x)^3)+(300/(1+x)^4)+(300/(1+x)^5)+(300/(1+x)^6）=0
    x(14-x)=24
    x^2-11.25x-13.5=0
    x^2-14x+20=0
    x^2-14x+24=0
    1.5x^2-57.6x=0

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