((-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)
    0.720427*18
    0.720427*18*2*3.14
    7.467455965526542*10
    2*18*0.720427*sin(3.14/11)
    2*18*0.720427*sin(3.14*2/11)
    4*asin(4/(18*0.720427*2))
    62/101×101
    62/1101×101
    9/2-18
    2/9-18
    3×16+49
    62/111×101

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