[(9.3*10^3)/(0.227*11.9)]^2
    -(1×1×1×1)-16÷[(-2)×(-2)×(-2)]+2×(-1)
    -(1×1×1×1)-16÷[(-2)×(-2)]+2×(-1)
    -(1×1×1×1)
    sqrt(2.25*1.5^2+11.4*1.5+116.854)/0.176+138.889=
    4*(2/√3)
    4*(2/√3)-2/√3
    arcsin1
    C(20,21)
    C(21,20)
    A(21,20)/A(20,20)
    12*（1/3-1/4+1/2）
    1/3-1/4+1/2
    （141+6√3）/16
    9/4+√2
    25（1+10%）5
    25（1+10%）
    （10.9196+10.704133）/2
    （10.763+10.753+10.749+10.749+10.747+10.731+10.723+10.711+10.707+10.703+10.698+10.665+10.657+10.613+10.593）/15
    （10.763+10.753+10.749+10.749+10.747+10.731+10.723+10.711+10.707+10.698+10.665+10.657+10.613+10.593）/15

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