如题所述
第1个回答 2016-11-08
2.58x9.9
=2.58x(10-0.1)
=2.58x10-2.58x0.1
=25.8-0.258
=25.542本回答被网友采纳
=2.58x(10-0.1)
=2.58x10-2.58x0.1
=25.8-0.258
=25.542本回答被网友采纳
第2个回答 2016-11-08
2.58x9.9
=2.58×(10-0.1)
=2.58×10-2.58×0.1
=25.8-0.258
=25.542
=2.58×(10-0.1)
=2.58×10-2.58×0.1
=25.8-0.258
=25.542
第3个回答 2016-11-08
看
第4个回答 2016-11-08
供参考