Question

Ghi kết quả tính:

15 − 7 + 8 = .....	6 + 7 − 9 = .....	12 − 5 + 7 = .....
17 − 9 + 8 = .....	9 + 6 − 7 = .....	14 − 5 + 3 = .....
8 + 8 − 9 = .....	17 − 8 + 6 = .....	6 + 9 − 9 = .....

Answer 1

Phương pháp giải:

Tính nhẩm từ trái sang phải rồi điền kết quả vào chỗ trống. 

Lời giải chi tiết:

15 − 7 + 8 = 16	6 + 7 − 9 = 4	12 − 5 + 7 = 14
17 − 9 + 8 = 16	9 + 6 − 7 = 8	14 − 5 + 3 = 12
8 + 8 − 9 = 7	17 − 8 + 6 = 15	6 + 9 − 9 = 6

Answer 2

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