75-25+25-75用简便方式计算

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75-25+25-75用简便方式计算75-25+25-75用简便方式计算75-25+25-75用简便方式计算75-25+25-75=75+25-(25+75)=100-100=08000-1-2-3-

75-25+25-75用简便方式计算
75-25+25-75用简便方式计算

75-25+25-75用简便方式计算
75-25+25-75
=75+25-(25+75)
=100-100
=0

8000-1-2-3-4.........-97-98-99-100
=8000-(1+2+3+···+100)
=8000-5050
=2950
75-25+25-75
=(75-75)+(25-25)
=0 。

75-25+25-75
=(75-75)+(25-25)
=0