4+8/p=5.6
    1.5s + 10 = 12.25
    3y - 1.6 = 1.7
    x^2=2
    2^x=1/x
    （7+y）（22-y）=170
    400a^(2)－800a+39=0
    x^4+75*x^2-100=0
    25x^2-60x+32
    2.718^(-2)/1-2.718^(-1)
    cosa=-9/√130
    cos(13/180)
    cos(13)
    2.718^(-2)
    4x
    400*8.314*（ln10）
    20*14.74/3.1415926*（tanx-x）+7.68*cosx=8.62
    0.67*720
    2.718^(-2/5)
    55x^2-56x+14=0

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