99乘999加99乘999加1乘4.怎么简便计算啊?

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99乘999加99乘999加1乘4.怎么简便计算啊?99乘999加99乘999加1乘4.怎么简便计算啊?99乘999加99乘999加1乘4.怎么简便计算啊?100x1000+100x1000x4-3

99乘999加99乘999加1乘4.怎么简便计算啊?
99乘999加99乘999加1乘4.怎么简便计算啊?

99乘999加99乘999加1乘4.怎么简便计算啊?
100x1000+100x1000x4-3