2022-08-12 06:30:19 +00:00
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# 均贫富
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```
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2022-08-12 10:14:12 +00:00
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明明的邮票：============================= 29
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小强的邮票：========= 9
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2022-08-13 01:04:24 +00:00
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问：明明给小强几张邮票后两个人的邮票就一样多了？
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2022-08-12 06:30:19 +00:00
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```
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2022-08-12 10:14:12 +00:00
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2022-08-16 05:46:33 +00:00
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$ a - x = b + x \quad (a \in \Bbb{N}, b \in \Bbb{N}, a>b) $
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2022-08-12 06:30:19 +00:00
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## 解法1
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2022-08-16 05:46:33 +00:00
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$
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\begin{aligned}
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2x &= a - b &(移项并交换等式两侧) \\\\
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x &= \frac{a-b}{2} &(等式两侧同除以2)
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\end{aligned}
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$
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2022-08-12 06:30:19 +00:00
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## 解法2
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2022-08-16 05:47:38 +00:00
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$ x = \dfrac{a+b}{2} - b $
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