Smile 發問時間: 科學及數學數學 · 1 個月前

Maths problem: how to do (b),  and (c). Thanks?

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1 個解答

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  • 1 個月前
    最佳解答

    (a)

    x = 2V/(zl)-y

    (b)

    l = 9cm, V = 459cm^3.

    z = 6cm, y = x + 3cm.

    ∴ 459 = (2x+3)×6×9/2

    ∴ x = 7cm

    (c)

    V = 459cm^3, l = 18cm, z = 3cm

    ∴ x + y = 2V/(zl)

          = 2(459)/(18×3) = 17cm ≠ 18cm

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