90-arcsin（1.31×sin（90-arcsin（sin（80）/1.31）））
    sin(π/2
    lg2.19
    3.15^1/3
    6.3/2
    21/19
    sqrt(4.8)
    1.43/3
    （3*（2.7+3+1.7+4+2.3+1.7+3.3+2+2.7+2.7）+2*（1+3.7+3.7+2.3+3.3+2.7+2.7+4）+1*（3.7+3.3+3.7+4））/50
    sqrt(2.6)
    lg1.43
    sqrt(2.03)
    4×3.14×82.61^2
    2.9×(31617.5×10%)^(1/3)
    16.6×10^3×3.14×[(457-7.1×2)/2×10^-3]^2
    3.14×(25/2×10^(-3))^2×0.61×√(2×750×(8-0.1))
    1.005312×10^(-5)×0.0010×86484.1×0.005
    1.005312×10^-5×0.0010×86484.1×0.005
    4×3.14×82.98^2
    lg2.4

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