Giải bài 1 (2.27) trang 34 vở thực hành Toán 7

Bài 1 (2.27) Sử dụng máy tính cầm tay làm tròn các số sau đến chữ số thập phân thứ nhất: \(a = \sqrt 2 ;b = \sqrt 5 \). Tính tổng hai số thập phân nhận được.

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Đề bài

Bài 1 (2.27) Sử dụng máy tính cầm tay làm tròn các số sau đến chữ số thập phân thứ nhất: \(a = \sqrt 2 ;b = \sqrt 5 \). Tính tổng hai số thập phân nhận được.

Phương pháp giải - Xem chi tiết

Sử dụng máy tính cầm tay

Lời giải chi tiết

Sử dụng máy tính cầm tay ta tính được \(\sqrt 2 = 1,4142... \approx 1,4\) (làm tròn đến chữ số thập phân thứ nhất) và \(\sqrt 5 = 2,2360... \approx 2,2\).Tổng hai số nhận được là 1,4 + 2,2 = 3,6.

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4.9 trên 7 phiếu

🍸 Giải bài 2 (2.28) trang 34 vở thực hành Toán 7 Bài 2 (2.28). Dùng thước dây có vạch chia để đo độ dài đường gấp khúc ABC trong hình 2.1 (đơn vị xentimet, làm tròn đến chữ số thập phân thứ nhất). So sánh kết quả với kết quả của bài tập 2.27.
🦋 Giải bài 3 (2.29) trang 34 vở thực hành Toán 7 Bài 3(2.29). Chia một sợi dây đồng dài 10 m thành 7 đoạn bằng nhau. a) Tính độ dài mỗi đoạn dây nhận được, viết kết quả dưới dạng số thập phân vô hạn tuần hoàn. b) Dùng 4 đoạn dây nhận được ghép thành một hình vuông. Gọi C là chu vi của hình vuông đó. Hãy tìm C theo hai cách sau rồi so sánh kết quả: Cách 1: Dùng thước dây có vạch chia để đo, lấy chính xác đến xentimet. Cách 2: Tính \(C = 4.\frac{{10}}{7}\), viết kết quả dưới dạng số thập phân với độ chính xác 0,005.
⛄ Giải bài 4 (2.30) trang 35 vở thực hành Toán 7 Bài 4(2.30). a) Cho hai số thực a = -1,25 và b = -2,3. So sánh a và b; \(\left| a \right|\)và \(\left| b \right|\) b) Ta có nhận xét trong hai số âm, số nào có giá trị tuyệt đối lớn hơn là số bé hơn. Em hãy áp dụng nhận xét này để so sánh -12,7 và -7,12.
𝓡 Giải bài 5 (2.31) trang 35 vở thực hành Toán 7 Bài 5(2.31). Cho hai số thực a = 2,1 và b = -5,2. a) Em có nhận xét gì về hai tích a.b và \( - \left| a \right|.\left| b \right|\)? b) Ta có cách nhân hai số khác dấu như sau: Muốn nhân hai số khác dấu ta nhân các giá trị tuyệt đối của chúng rồi đặt dấu “-“ trước kết quả. Em hãy áp dụng quy tắc trên để tính (-2,5).3.

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