(5.133+2.591)*28*2.98+3*3.643*2.98
    sin-120
    tan-120
    atan√3
    15*(20+1.189)*3.85+15*(29.028+1.289)*3.85+8*4.115*3.85
    log（3，24/5）
    log（5，31/2）
    115267985250/10582349865000
    607/32
    -1.148359^2
    5/8-1/4*（8/9/2/3）
    25*(12.214+1.189)*4.83+7*3.172*4.83
    240/13
    240/13
    C(4,3) C(4,1)
    4*1/8
    4*8/1
    4*0.125
    1×2×3×4×......×2012
    4-⅝

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