-15.25/0.04
    20÷21.75×6500+100
    [1−(1+4%)−(75.21−60)]
    arctan1
    arctan1
    arctan2.13
    arctan2.13
    332.82 × 9−4.5 × 332.82 +0.5×12.72 ×10.36² ×(4.5 − 1/3× 10.36)
    (12.72 × 10.36 − 56.22) × 4.5
    1.21*0.5+0.01*0.1+0.81*0.2+1.9*1.9*0.2
    1.21*0.5*0.01*0.1+0.81*0.2+1.9*1.9*0.2
    (2×3.14×8^2)/(300×100×4)=
    5.283185/19.7396
    2π-1
    9.8698*2
    π^2
    （2π-1）/2π^2
    π^（1/π）
    sin(1/π)
    1×14.3×1000×0.003×360/360

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