tanx=0.03
    （100-x）*2=（150-x）*1
     2-x/1 e
    x×(540-x/2)=55459.20746
    8.8=x-x*0.12
    x^2sinx=10sinx
    2^2k=(16/9)3^k
    2^2k=(16/9)3^k
    x=20/23*tan(x)
    arctanx+arctan2x=π/2
    1.36*x^4+0.36*x^2+x^6-1=0
    arctanx+arctan2x=π
    5x²-4x-217=0
    106243476.30-0.51X
    11xx-36x-16=0
    x＾2+x-82/9
    （52-2x）（46-2x）＝1840
    8a- 10=6 a- 4
    2x- 3×2=x×2×4
    -2x²+220x-4800=1200

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