2.5*5.6*1.42的简便运算

Question

2.5*5.6*1.42的简便运算

Answer 1

【速算】
2.5*5.6*1.42
=2.5x4x1.4x1.42
=14x1.42
=14x（1.4+0.02）
=19.6+0.28
=19.88本回答被网友采纳

Answer 2

请

本回答被网友采纳

Answer 3

2.5*5.6*1.42=2.5*4*1.4*1.42=14*1.42=（15-1）*1.42=21.3-1.42=19.88