S.3 Maths Ch. 8.4 Mid-point Theorem (Part I) + Lesson Work sheet 0:25:55

S.3 Maths Ch. 8.4 Mid-point Theorem (Part I) + Lesson Work sheet
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8.4b 0:09:20

8.4b
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Ch. 12.2 (Example & H.W) 0:19:11

Ch. 12.2 (Example & H.W)
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預習影片：地球的結構 (1mins) 0:00:52

預習影片：地球的結構 (1mins)
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IS_S1_Expt_2.4 0:01:13

IS_S1_Expt_2.4
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