arctan1.22+arctan0.244
    3*sqrt(5-23/7)+2*sqrt(3*23/7-3)
    3*sqrt(5-23/7)+2+sqrt(3*23/7-3)
    0.514*0.0125
    0.714*0.0125
    0.86*0.0125
    0.8*0.125
    -1/2*(3/2)^2+3/2*3/2+2
    atan(1/0.7)
    (22.4*2200*105.33-1260*3*1260)/330
    √136
    6*6+10*10
    5×10^17÷4×10^-4
    sqrt4
    12%=
    （60×1.1+1.5）×10/0.86/4
    （36+1.5）/2×10/（0.86）/2
    （36+1.5）/2×10/（0.7）/2
    15000/25.4
    0.2+0.5*0.589^2

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