x-4=4x
    x=4x+4
    (x+3)(x+1）(x-3)
    5.67*0.9*（1300^4-298^4）/(1300-298)/10^8
    0.4+x=2.3
    （x-6）+（x-4）+1=x
    0.15*(1.4*10^8)^(1/3)
    (0.825+(0.387*(4.67*10^10)^(1/6))/(1+(0.492/0.7014)^(9/16))^(8/27))^2
    686^1/3
    sin53
    11.397 = （（1/0.201+1/0.224+x)+sqrt((1/0.201+1/0.224+x)^2-4/(0.201*0.224))/2*0.224 )
    (2-300Y)/300
    -7/15
    -11/15
    2/3-（5/6-3/4）÷3/8
    4/5+105%
    36.9/18
    (a-3)/(3a^2-6a)/(a+2-5/(a-2))
    (sin50*sin18/cos30/cos2)^(1/2)
    (1+(sin50*sin18/cos30/cos2)^(1/2))

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