很急:甲．乙兩整數且甲大於0又|2x甲|＋｜乙｜＝5試寫出甲x乙所有可能值?
回答 (1)
2020-10-03 12:06 pm
A, B 是整數, A > 0. 則
|2A| + |B| = 2A + |B| = 5
所以 A 只可能是 1 或 2.
A = 1, 則 |B| = 3, B = 3 或 -3.
A = 2, 則 |B| = 1, B = 1 或 -1.
所以 A×B 有 4 種情形:
1 × 3 = 3
1 × (-3) = -3
2 × 1 = 2
2 × (-1) = -2.
|2A| + |B| = 2A + |B| = 5
所以 A 只可能是 1 或 2.
A = 1, 則 |B| = 3, B = 3 或 -3.
A = 2, 則 |B| = 1, B = 1 或 -1.
所以 A×B 有 4 種情形:
1 × 3 = 3
1 × (-3) = -3
2 × 1 = 2
2 × (-1) = -2.
收錄日期: 2021-05-04 02:31:42
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20201003035031AAp7dfs