(521.3-y)/y=7.7%
    (521.3-y)/y=7.7
    (528.6-y)/y=7.4%
    (547.1-y)/y=7.4%
    10÷y+110÷y²＝27
    10÷y+110÷y²＝－27
    93=10/(1+y)+110/(1+y)²
    5*10^(-6.76)=x^2+0.025x
    x^2+0.005*x=10^(-2.76)
    360x=1×14.3×1800×14.5
    150000000=1.0×14.3×1800x（410-1/2×x）
    0=1/3x²-2/3x+1
    √6*arctan（√（x/6））-arctan（√x）=59.12
    x/100+x
    x^x=2x
    315=330cosx
    x=22cos20
    x=22cos8
    (x-2)(x+3)(x+2)-10+6+15(x-2)-4(x-3)-(x+2)=0
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.732976)

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