6.28乘以0.8减0.628加0.3乘6.28怎样算才简便?

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6.28乘以0.8减0.628加0.3乘6.28怎样算才简便?
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6.28乘以0.8减0.628加0.3乘6.28怎样算才简便?
6.28乘以0.8减0.628加0.3乘6.28怎样算才简便?

6.28乘以0.8减0.628加0.3乘6.28怎样算才简便?
6.28乘(0.8减0.628加0.3)