3.14x5x5+2x3.14x2.5x2.5+5x2x2怎么列式

3.14x5x5+2x3.14x2.5x2.5+5x2x2
=3.14x（5x5+2x2.5x2.5）+20
=3.14x（25+12.5）+20
=3.14x37.5+20
=117.75+20
=137.75

答题不易，望采纳~~~

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