2.25+3.62×53.8+4.29++2.71+4.2的简便方法？
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2.25+3.62×53.8+4.29+2.71+4.2
解:=2.25+3.62×53.8+（4.29+2.71）+4.2
=2.25+3.62×53.8+7+4.2
=2.25+7+4.2+3.62×53.8
=13.45+3.62×53.8
=208.206
解:=2.25+3.62×53.8+（4.29+2.71）+4.2
=2.25+3.62×53.8+7+4.2
=2.25+7+4.2+3.62×53.8
=13.45+3.62×53.8
=208.206
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