C(8,2
    ln114514
    20-（20*0.35）=
    20*0.35=
    8√3*5
    12.967686*sin(2*3.14/11)
    arctan0.5
    12.967686*cos(2*3.14/8)
    12.967686*cos(2*3.14/11)
    12.967686*2*3.14/11
    12.967686*2*sin(3.14/11)
    ((-3-3√5)÷2)^2+4(-3-3√5)÷2+(-3+3√5)÷2
    ((-3+3√5)÷2)^2+4(-3+3√5)÷2+(-3-3√5)÷2
    0.854102^2
    1.854102^2
    1/4*400-10*20+126
    sqrt（8.46）
    0.720427*18-0.720427*18*sin(6.28/11)
    0.720427*18*cos(6.28/11)
    114514*(11-4+5+1-4)

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