Trả lời Hoạt động 2 trang 67 SGK Toán 6 Kết nối tri thức với cuộc sống

Tính và so sánh kết quả của 4 - (12 – 15) và 4 - 12 + 15. Hãy nhận xét về sự thay đổi dấu của các số hạng trong dấu ngoặc trước và sau khi bỏ dấu ngoặc.

𒁏Tổng hợp đề thi học kì 2 lớp 6 tất cả các môn - Kết nối tri thức

Toán - Văn - Anh - Khoa học tự nhiên...

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Đề bài

Hãy nhận xét về sự thay đổi dấu của các số hạng trong dấu ngoặc trước và sau khi bỏ dấu ngoặc.

Video hướng dẫn giải

Phương pháp giải - Xem chi tiết

Nhận xét khi: + Trước dấu ngoặc là dấu "+ " + Trước dấu ngoặc là dấu "- "

Lời giải chi tiết

ౠ+ Khi bỏ dấu ngoặc có dấu " + " đằng trước, dấu của các số hạng trong dấu ngoặc trước và sau khi bỏ dấu ngoặc được giữ nguyên.

♎+ Khi bỏ dấu ngoặc có dấu " - " đằng trước, dấu của các số hạng trong dấu ngoặc trước và sau khi bỏ dấu ngoặc thay đổi: dấu " + " đổi thành " - " ; dấu " - " đổi thành " + ".

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4.7 trên 33 phiếu

🧔 Trả lời Luyện tập 1 trang 68 SGK Toán 6 Kết nối tri thức với cuộc sống Bỏ dấu ngoặc rồi tính các tổng sau: a) (-385 + 210) + (385 - 217); b) (72 - 1 956) - (-1956 + 28).
🍎 Trả lời Luyện tập 2 trang 68 SGK Toán 6 Kết nối tri thức với cuộc sống Tính một cách hợp lí: a) 12 +13 + 14 - 15 - 16 - 17; b) (35-17) - (25 - 7 + 22).
꧙ Trả lời Thử thách nhỏ trang 68 SGK Toán 6 Kết nối tri thức với cuộc sống Cho bảng 3 x 3 ô vuông như hình 3.17. a) Biết rằng tổng các số trong mỗi hàng, mỗi cột, mỗi đường chéo đều bằng 0. Tính tổng các số trong bảng đó. b) Hãy thay các chữ trong bảng bởi số thích hợp sao cho tổng các số trong mỗi hàng, mỗi cột, mỗi đường chéo đều bằng 0.
♎ Giải Bài 3.19 trang 68 SGK Toán 6 Kết nối tri thức với cuộc sống tập 1 Bỏ dấu ngoặc và tính các tổng sau: a) -321 + (-29) - 142-(-72); b) 214-(-36) + (-305).
ꦇ Giải Bài 3.20 trang 68 SGK Toán 6 Kết nối tri thức với cuộc sống tập 1 Tính một cách hợp lí: a) 21 - 22 + 23 - 24; b) 125 - (115 - 99).

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Luyện Bài Tập Trắc nghiệm Toán 6 - Kết nối tri thức - Xem ngay

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Tham Gia Group Dành Cho Lớp 6 Chia Sẻ, Trao Đổi Tài Liệu Miễn Phí

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