问题
填空题
650+780=780+______，这是应用了加法______律．用字母表示为______．
答案
650+780=780+650，这是应用了加法交换律．
用字母表示为 a+b=b+a．
故答案为：650，交换，a+b=b+a．
搜题请搜索小程序“爱下问搜题”
650+780=780+______，这是应用了加法______律．用字母表示为______．
650+780=780+650，这是应用了加法交换律．
用字母表示为 a+b=b+a．
故答案为：650，交换，a+b=b+a．
a. His books became popular. b. His family enjoyed his books. c. He passed on in a fire. d. He started to draw animals. e. He was born on a farm.
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