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dantreucho
2 năm trước
Ai giúp em điền đáp án môn toán với ạ em cảm ơn Cho hệ phương trình { 3x + 2y = -4 { 2x -2y = - 4 Áp dụng quy tắc cộng đại số, ta có: + Bước 1: Cộng hai vế các phương trình của hệ, ta được ......... hay..........(*). + bước 2 Thay phương trình (*) cho phương trình thứ nhất, được hệ ....... hoặc thay cho phương trình thứ hai, được hệ ..........
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