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年龄拓展：这样的倍数关系，怎样寻找突破口？
年龄问题：今年，爸爸的年龄是小明的9倍，5年后，爸爸的年龄是小明的4倍。今年他们各多少岁？
Grade 3 思维训练，让孩子体验，从不会到会的喜乐14/44
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