Mathematics
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    (0.20+2*0.15)+2*0.86
    0.60+2*0.15
    (-7)^3-63*7+6*49+3
    (square5-4)/2
    sin18
    (-2)^(2/5)+(-2)^(7/5)
    (-1/2)^(-2/5)+(-1/2)^(-7/5)
    (-2)^(-2/5)+(-2)^(-7/5)
    ((x+1)^2-2)/(x+2)=x
    21×3.2×0.128
    21×38.1×0.128
    21×20.65×0.128
    21×20.65×(1-20.65×0.128×tan(55)/14.85)
    300.132/21
    300.132*0.5
    0.45 × 2^(5-1) × 21×1.985
    1+0.1×(14.85-5)
    2921-2004
    23×50+1771
    9×2+5

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