Below is a suggested solution provided by Mr. Vo Quang Tien, Math teacher, collaborator of tuyensinh247.com.
Hai Yen
Source: https://baodongnai.com.vn/xa-hoi/giao-duc/202505/goi-y-dap-an-mon-toan-cua-ky-thi-tuyen-sinh-vao-lop-10-nam-hoc-2025-2026-2941818/
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