小学五年级奥数题及答案:简便运算
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
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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
【小学五年级奥数题及答案:简便运算】相关文章: