2.5×32.4
    0.125×0.88
    12.5×0.064
    0.4 × 1.25 × 25 × 0.8
    89.2 × 0.05 × 0.02
    26×12.5×0.8
    0.867×2.5×4
    （175+5）*600*80%*5%
    Xx0.15=2000
    0.15x=2000
    0.15=2000/X
    2^log(2,3)
    （x-15）*（58-x）
    289y^(2)+374y+121=0
    sin6
    X*0.77=29.9
    x*10.4%=293.42
    x*10.4%=300
    X*0.77=3.98
    sqrt(100+x^2)-x

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