小学五年级奥数题及答案:简便运算_奥数奥数知识点_奥数知识点-查字典奥数网
小学五年级奥数题及答案:简便运算
2015-11-17 14:47:00
标签:奥数杂题
657-(269+357)+169
答案与解析:
657-(269+357)+169
=657-(357+269)+169
=657-357-269+169
=300-(100+169)+169
=300-100-169+169
=200-169+169
=200
点击显示
小学五年级奥数题及答案:简便运算_奥数奥数知识点_奥数知识点-查字典奥数网
小学五年级奥数题及答案:简便运算
2015-11-17 14:47:00
标签:奥数杂题
657-(269+357)+169
答案与解析:
657-(269+357)+169
=657-(357+269)+169
=657-357-269+169
=300-(100+169)+169
=300-100-169+169
=200-169+169
=200
点击显示