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问答题
If each of★ and ◆ can be replaced by +, -, or ×, how many different values are there for the expression 2 ★ 2 ◆ 2?
参考答案
参考解析
解析：
只需列举出把★和◆替换成+，-，×三种符号后的结果，如下所示：
2+2+2=6
2-2-2=-2
2×2×2=8
2+2-2=2
2-2×2=-2
2×2+2=6
2+2×2=6
2-2+2=2
2×2-2=2
2×2-2=2
由此可见，共有-2，2，6，8四种结果。
只需列举出把★和◆替换成+，-，×三种符号后的结果，如下所示：
2+2+2=6
2-2-2=-2
2×2×2=8
2+2-2=2
2-2×2=-2
2×2+2=6
2+2×2=6
2-2+2=2
2×2-2=2
2×2-2=2
由此可见，共有-2，2，6，8四种结果。
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