答案:21

首先我們先來馬匹等於多少

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一匹馬=10

同時,我們也得出一個馬蹄鐵是2

horse horseshoe boots viral algebra problem solution 3

馬靴是1

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最後得到算式:1 + 10 × 2 = 1 + 20 = 21.

horse horseshoe boots viral algebra problem solution 5