"9.999乘222.2+3.333乘333.4"怎么简便计算

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"9.999乘222.2+3.333乘333.4"怎么简便计算"9.999乘222.2+3.333乘333.4"怎么简便计算"9.999乘222.2+3.333乘333.4"怎么简便计算9.999×2

"9.999乘222.2+3.333乘333.4"怎么简便计算
"9.999乘222.2+3.333乘333.4"怎么简便计算

"9.999乘222.2+3.333乘333.4"怎么简便计算
9.999×222.2+3.333×333.4
=3.333×3×222.2+3.333×333.4
=3.333×666.6+3.333×333.4
=3.333×(666.6+333.4)
=3.333×1000
=3333