2（3x-5）+20<3-8（x+2）
    3（x+2） ≥4（x-1）+7
    9.8*(69*((0.33*61.25-v)/61)/0.33-35) = 0.5*(1.225*13.1/6)*v^2
    sinx/x = 0.0048^0.5
    3（x+2）≥4（x-1）+7
    2xxx+5/3*xx+6x-3=0
    sinx/x=0.0048^0.5
    0.28/(0.2-x)=2*ln((0.2-x)/(0.11-x))-ln((0.2-x)/(0.15-x))
    0=2x^2-5x-48
    sinx/x=4.8^0.5
    4+x^2=(4-x)^2
    500*（x^10-1）/(x^10*(x-1))=0
    （10-2x）(6-2x)=12
    3^2+(6-3t)^2=(10-3t)^2
    x÷36+x÷24=1.5
    x∧3+0.8*x∧2-0.23*x-0.21=0
    (362*0.514+x) /(362+x) =0.6
    2/9x=980
    (128*0.500+x) /(128+x) =0.6
    3x^3-3x^2+400=0

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