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0.21÷0.021怎样列竖式

0.21÷0.021=10

8.4 ÷ 0.021 = 8400 ÷ 21 = 400

1.68÷0.021 =1680 ÷ 21 = 80 竖式见图:

0.021×0.42=0.00882

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