2.009×390+20.09×41+200.9×2简便计算

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2.009×390+20.09×41+200.9×2简便计算
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2.009×390+20.09×41+200.9×2简便计算
2.009×390+20.09×41+200.9×2简便计算

2.009×390+20.09×41+200.9×2简便计算
20.09×39+20.09×41+20.09×20
=20.09×(39+41+20)
=20.09×100
=2009

200.9

2.009×(390+410+200)=2009

原始等于20.09(39+41+20)=2009

2.009×390+20.09×41+200.9×2
=20.09×39+20.09×41+20.09×20
=20.09×(39+41+20)
=20.09×100
=2009

=20.09*39+20.09*41+20.09*20=20.09*(39+41+20)=20.09*100=2009

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