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khoahai98
2 năm trước
Bàl 3: (2,0 điểm) Giải bài toán bằng cách lập phương trình: Một số tự nhiên có hai chữ số, trong đó chữ số hàng đơn vị lớn hơn chữ số hàng chục là 3. Nếu thêm chữ số 1 xen vào giữa hai chữ số ấy thì được số mới lớn hơn số ban đầu là 370. Tìm số ban đầu. Bài 4: (1,0 điểm) Tìm m để hai phương trình sau tương đương : x²-4x + 15 = 4x -1 (1) và 5x = 3m - 2 (2). Mọi người giúp mik với :(!
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