Mathematics
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     0.04*10 + 0.16*8 + 0.16*20+ 0.64*3
     0.25*10 + 0.25*8 + 0.25*20 + 0.25*3
    (10+8+20+3) / 4
    tan4π/3
    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

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