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     [300-(100-60)]×(1-25%)+60
    (300-100)×(1-25%)+60×25%
    [300-(100-60)]×(1-25%)+60×25%
    -2-3=
    -3^2+3^3-3^2
    -3^4/(9/4)+(4/9)/(-2^4)
    abs(-2-1/4)+3/4+1-abs(1-1/2)
    abs(-2+1/4)+3/4+1-abs(1-1/2)
    ^3−2^2−144
    1-8%*(1-10%)=
    10%/(1-5%*(1-10%))=
    10*sin2
    [2305×(1+0.0585)×1.0755×1.2487+0]×0.9161
    [1-1/(1+8.0%)^26.91]/[1-1/(1+8.0%)^40
    [1-1/(1+8.0%)26.91]/[1-1/(1+8.0%)40
    -5/5
    3*1000*1.05*1.045*1.045
    2*50%+1.5*30%+2.5*20%
    [(12%×50%)^2+(20%×50%)^2+2×12%×50%×20%×50%×0.2]^0.5
    (7.5%-4.5%+7.9%-5%+8.3%-5.2%)/3

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