Giải bài tập 9.1 trang 67 SGK Toán 9 tập 2 - Cùng khám phá

Tìm tên gọi thích hợp cho các ô ? trong Hình 9.12.

Tổng hợp Đề thi vào 10 có đáp án và lời giải

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Tìm tên gọi thích hợp cho các ô ? trong Hình 9.12.

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♎ Giải bài tập 9.2 trang 67 SGK Toán 9 tập 2 - Cùng khám phá Tìm các số và đơn vị thích hợp trong các ô ? để hoàn thành Bảng 9.1.
🐼 Giải bài tập 9.3 trang 68 SGK Toán 9 tập 2 - Cùng khám phá Từ một tấm bìa hình chữ nhật với đồ dài hai cạnh là 20 cm, 15 cm có thể cuộn lại và dùng băng dính dán thành hình trụ A hoặc hình trụ B (không có nắp) như Hình 9.13. a) Hãy so sánh thể tích của hai hình trụ A và B. Giải thích câu trả lời của em. b) Nếu cắt tấm bìa thành hai phần X, Y bằng nhau và tạo thành hai hình trụ (không có nắp) cùng chiều cao 15 cm thì tổng thể tích của hai hình trụ này có lớn hơn thể tích của hình trụ B không? Vì sao?
ꦓ Giải bài tập 9.4 trang 68 SGK Toán 9 tập 2 - Cùng khám phá Một cái thớt gỗ hình trụ có đường kính đáy 40 cm, dày 5 cm như Hình 9.14. a) Tính thể tích gỗ cần dùng để làm thớt. b) Khối lượng riêng của gỗ làm thớt là D = 500 kg/m3. Hỏi cái thớt nặng bao nhiêu gam (làm tròn đến hàng phần mười), biết khối lượng m (kg) của một vật có thể tích V (m3) là m = D.V?
❀ Giải bài tập 9.5 trang 68 SGK Toán 9 tập 2 - Cùng khám phá Hình 9.15 là một tủ chứa đồ. Biết cung CDE là nửa đường tròn. a) Tính thể tích của tủ đồ. b) Người ta muốn sơn tất cả các mặt ngoài của tủ (kể cả đáy). Hỏi diện tích cần sơn là bao nhiêu mét vuông (làm tròn kết quả đến hàng phần mười)?
ꦑ Giải mục 4 trang 66, 67 SGK Toán 9 tập 2 - Cùng khám phá Tạo lập hình trụ có bán kính đáy 3 cm và chiều cao 5 cm theo các bước sau: Bước 1: Cắt hai miếng bìa hình tròn có bán kính bằng 3 cm và một miếng bìa hình chữ nhật có chiều rộng 5 cm, chiều dài bằng chu vi của miếng bìa hình tròn vừa cắt (Hình 9.10a) Bước 2: Dùng băng dính để dán các miếng bìa lại để được một hình trụ (Hình 9.10b).

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