2.011乘390+20.11乘41+201.1乘2+

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2.011乘390+20.11乘41+201.1乘2+
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2.011乘390+20.11乘41+201.1乘2+
2.011乘390+20.11乘41+201.1乘2+

2.011乘390+20.11乘41+201.1乘2+
2.011乘390+20.11乘41+201.1乘2
=20.11*39+20.11*41+20.11*20
=20.11*(39+41+20)
=20.11*100
=2011