6.15×9.4-42 怎么简算!

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6.15×9.4-42 怎么简算!

6.15×9.4-42
=6.15×(10-0.6)-42
=61.5-3.69-42
=61.5-42-3.69
=19.5-3.69
=15.81

6.15×9.4-42
=6.15×(10-0.6)-42
=61.5-3.69-42
=15.81