(0.26×10^6)/33750
    (51.42×0.20×0.20)/8
    (5×41.58×200^4)/(384×9898×253125)
    (5×41.58×250^4)/(384×9898×253125)
    (0.40×10^6)/33750
    A(36,28)
    A(36,10)
    A(10,10)
    C(5,5)
    A(5,5)
    （0.3+24×1.8+1.5×1.8）×0.9
    (5×41.58×250^4)/(384×9898×129600)
    (0.40×10^6)/21600
    (51.42×0.25×0.25)/8
    （0.3+24×1.8+1.5×1.8）×0.9
    0.9×(1.3×(0.3+24×1.8+1.5×1.8)+1.5×(2.5+2))×0.9
    ln1.5
    sin0.5
    (0.2×5517.2)/(200×8)
    (0.2×5985.99)/(200×8)

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