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Sử dụng dữ kiện bài toán sau đây để trả lời Bài 1, 2, 3.

Cho hệ phương trình \(\left\{ \begin{array}{l}3x - 2y = 11\\x + 2y = 1{\rm{ }}\end{array} \right.\). Thực hiện giải hệ phương trình bằng phương pháp cộng đại số, ta có:

- Bước 1: Cộng từng vế của cả hai phương trình của hệ ta được phương trình………(1)

- Bước 2: Giải phương trình, ta được…….(2)

- Bước 3: Thế giá trị vừa tìm được vào phương trình x + 2y = 1 ta tìm

Sử dụng dữ kiện bài toán sau đây để trả lời Bài 1, 2, 3.Cho hệ phương trình \(\left\{ \begin{array}{...