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

Question

Answer 1

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