15×0.69×0.5=
    15×6.9×0.5=
    sqrt(5/2)
    12/35-16/63+20/99
    (0.677×9.28×900^4)/(100×9000×8333333.33)
    (3×6.52×10^3)/(2×100×100)
    (0.98×10^6)/166666.67
    0.6×12.07×0.9
    (12.07×0.9×0.9)/10
    （0.3+0.2+24×1.8+1.5×1.8）×0.2
    0.9×(1.3×(0.3+0.2+24×1.8+1.5×1.8)+1.5×(2.5+2))×0.9
    0.9×(1.3×(0.3+0.2+24×1.8+1.5×1.8)+1.5×(2.5+2))×0.2
    0.9×(1.3×(0.3+24×1.8+1.5×1.8)+1.5×(2.5+2))×0.9
    0.9×(1.3×(0.3+0.2+24×1.8+1.5×1.8)+1.5×(2.5+2))×0.2
    (5×41.58×200^4)/(384×9898×253125)
    (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

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