-81/20*2.5*(-8)
    -8/5*(7/32-5/16)*2/5
    -1-(1-0.5)*4/3*(-1/11)
    1^4-(1-0.5)*4/3*(-1/11)
    1^4-(1-0.5)*4/3*1/11
    1^4-(1-0.5)*4/3/(-2-9)
    1^4-(1-0.5)*2^2/3/(-2-9)
    -1^4-(1-0.5)*2^2/3/(-2-9)
    2^6-[-16+(0.5*1/4-1)/(-7/4)]
    2^6-[-2^4+(0.5*1/4-1)/(-7/4)]
    1-(2+1/12-25/4)*1/2
    4+2/3
    14/3
    (7/3-7/2+35/18)/(-7/6)*(-7)
    8/（0.88*0.133）
    (5/4)^26*0.8^25-(3^3-2^3)*(-1/7)
    (5/4)^26*0.8^26-(3^3-2^3)*(-1/7)
    2/[(-0.5)^3-1.5^2]-2/(-1/2)^3
    (-29-2/7)*(-1/5)
    -25-[-4+(1-0.2*1/5)*(-1/2)]

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