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Huigen mathematics
Solution: ∵ The two sticks are 80cm. 120cm respectively.

∴ The midpoints of the two rods are respectively far away from the coincident endpoints.

80/2 = 40 cm, 120/2 = 60 cm

The distance between the midpoint of two sticks is 60-40 = 20cm.

By the way, let me remind you that because the symbol is ∷, it is ∴. You wrote the last question wrong.

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