100乘7.9加184乘2.1加84乘2.9简便运算

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100乘7.9加184乘2.1加84乘2.9简便运算
100乘7.9加184乘2.1加84乘2.9简便运算

100乘7.9加184乘2.1加84乘2.9简便运算
100x7.9+184x2.1+84x2.9
=100x7.9+100x2.1+84x2.1+84x2.9
=100x(7.9+2.1)+84x(2.1+2.9)
=100x10+84x5
=1000+420
=1420