這道简便计算不会，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
利用位值原理，提出公因數4，也就找到了25的好朋友，剩下就可以秒解了.
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