(50×50）×25
    (0.25×10^6)/(0.83×10^5 )
    1/8×5.6×〖0.6〗^2
    27.98×0.2
    (0.667×3×600^4)/(100×1.94×10^9 )
    (0.49×10^6)/(5.4×10^4 )
    1/10×13.58×〖0.6〗^2
    [1.2×(3+0.15)+1.4×(3.0+2.0+2.0)]
    0.22×25×200/(20+15)×1.2×1.15×2^0.5
    (0.667×15×200^4)/(100×1.94×10^9 )
    (0.11×10^6)/(5.4×10^4 )
    1/10×27.98×〖0.2〗^2
    [1.2×(15+0.15)+1.4×(3.0+2.0+2.0)]
    1-6/e^(-5)
    arcsin(-0.029511)
    arcsin(-0.029511)
    tan（arccos0.95）
    tan（arccos0.93）
    cos(3.14/7)+cos(3*3.14/7)+cos(5*3.14/7)
    cos(3.14/7)cos(3*3.14/7)cos(5*3.14/7)

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