6500/21.75/8*19*2-[6500/21.75/8*19*2-800]*0.2
    arctan0.6939
    337.50+137.50
    5500×10×25
    4500×10×75
    4000×10×75
    13.17+30.49+280.10
    9^10
    60.2214*4.528
    √4.24
    18906-18906*11%=
    33360*2*3.1415926/60
    (1.4*287*340.4048）^0.5
    343.15*0.992
    343.15*0.99
    343.15*0.995
    √9
    5^3
    5^2
    5^1

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