1.3×((0.3+0.2+0.16+3)×0.9×0.9+(24+1.5)×1.8×0.9×0.9)+1.5×((2.5+2.0)×0.9×0.9)
    (6×19)/((19+1)×(19+2))×17.6/17
    1/2×11×11×0.22+11×0.39
    (34.14×10^3×44.2×10^3)/(4880000×5)
    (4.89×10^6)/77000
    2/3.1415926
    tan1.07978
    1073741824×1073741824
    (0.677×7.43×900^4)/(100×9000×3413333.33)
    (100×100×100×100)/12
    (80×80×80×80)/12
    (0.677×7.43×900^4)/(100×9000×3413333.33)
    (3×5.22×10^3)/(2×80×80)
    (0.78×10^6)/85333.33
    0.6×9.66×0.9
    (9.66×0.9×0.9)/10
    （0.3+0.2+24×1.8+1.5×1.8）×0.16
    0.9×(1.3×(0.3+0.2+24×1.8+1.5×1.8)+1.5×(2.5+2))×0.16
    (80×80×80×80)/12
    (80×80×80)/6

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