15.7减0.7乘2.8简算

15.7减0.7乘2.8简算
2024-11-29 22:15:58
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回答1:

15.7减0.7乘2.8简算
=15.7-0.7x(3-0.2)
=15.7-0.7x3+0.7x0.2
=15.7-2.1+0.14
=13.6+0.14
=13.74