Mathematics
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    tan6π/5
    cos60+asin0.5=
    114514×1919810
    3 6 0 ÷ 1 2 0 ; 5 5 8 × 5
    √111111110 888888889
    2^11-1
    2^13-1
    2×(2013-201.2÷0.1)+[-(-8-0.5)÷1.7-(-3)]
    2×100000+4×50000+8×25000+16×12500+32×6250+64×3125
    (√5-2)^2
    1.553lg(35/90)/0.18
    1.553/0.18*lg(2/9)
    lg(2/9)
    21+43
    (2689-2069)/2689
    2689-2069/2689
    2069×30%+2069
    2^(2^(2^2))
    3^(3^(3^3))
    5^8.5×2

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