2.9×9.9×0.29,简便算法?
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要能简便计算,应该是(2.9×9.9+0.29)吧?
2.9×9.9+0.29
=2.9×9.9+2.9×0.1
=2.9×(9.9+0.1)
=2.9×10
=29
2.9×9.9+0.29
=2.9×9.9+2.9×0.1
=2.9×(9.9+0.1)
=2.9×10
=29
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