{{1+1}}
    1+1
    5/8ln5/4
    2/5*0.4/(1-2/5*0.4)
    0.8*1.1/0.02
    4sin0.25
    cos0.25
    cos1/4
    31/32＝
    31/32＝
    31/32
    cos1/4
    4sin1/4
    1.5*1.05/0.05
    19672+19672*0.0946
    19672+19672*0.05
    0.4/0.039*0.12
    0.4*1.06/0.04
    0.05+0.7*（0.12-0.05）
    arctan0.318

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