23*2.5
    √2*9/2
    √2*4.68
    cos（2×0）+2sin0
    cos0+2sin0
    1-1=
    sqrt(10000000000000)
    3×3
    3.1415926/4
    π*1
    (sin47.653541)/2+(47.653541/360)*π
    (47.653541/360)*π
    (47.653541/360)
    24000-2400-5.712%
    π/4
    sin47.65
    sin47
    （1+124.798)(500-1000/124.798^2-2000/124.798-2*124.798）
    (1+1/8)(500-1000*4-2000*8-1/4)
    (1+124.798)*(500-1000/124.798^2-2000/124.798-2+124.798)

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