21×427
    (502.50-496.38)/502.50
    17950÷42
    1500×12
    21÷1.75
    7÷4
    -2601÷41
    (2/3)*sqrt((3-2*0.05)/0.05)*0.308031
    999-3600
    cos(-1.257674)
    (1/3)(2.509974-2*3.1415)
    (1/3)(2.509974)-2*3.1415
    arccos(-0.807073)
    (36-7*0.05)*(0.131305)/(-6+4*0.05)
    sqrt(0.05/(3-2*0.05))
    0.05/(3-2*0.05)
    3/2-3/4×4/5×5×5/8
    1.13/(0.8
     0.3*3.75
    0.3*3.750.3

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