Lý thuyết: Bài 13. Tính chất giao hoán, Tính chất kết hợp của phép cộng

Tính chất giao hoán, Tính chất kết hợp của phép cộng

🤪Tổng hợp đề thi học kì 2 lớp 4 tất cả các môn - Chân trời sáng tạo

Toán - Tiếng Việt - Tiếng Anh

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1. Tính chất giao hoán

Tính và so sánh giá trị các biểu thức:45 + 47 = 47 + 458 154 + 695 = 695 + 8 154

a + b = b + a Khi đổi chỗ các số hạng trong một tổng thì tổng không thay đổi

2. Tính chất kết hợp của phép cộng:

Tính và so sánh giá trị các biểu thức:(7 + 9) + 5 = 7 + (9 + 5)(59 + 28) + 12 = 59 + (28 + 12)

(a + b) + c = a + (b + c) Khi cộng một tổng hai số với số thứ ba, ta có thể cộng số thứ nhất với tổng của số thứ hai và số thứ ba Chú ý: Ta có thể tính giá trị của biểu thức dạng a + b + c như sau: a + b + c = (a + b) + c = a + (b + c)

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Lý thuyết: Bài 13. Tính chất giao hoán, Tính chất kết hợp của phép cộng

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