這道題不會，數學就很難上90分了 #数学思维 #小学数学 #小学奥数 #趣味数学 #數學補習 #学霸秘籍 #数学 #小學生 #數學
Synopsis
数的组合与分解，先找等量代換，然后利用构造思维，就可以秒解了.
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