Question

2.6×9.9简便写法

Answer 1

2.6x9.9
=2.6x(10一0.1)
=2.6x10一2.6x0.1
=26一0.26
=25.83

Answer 2

2.9×(9+0.9)＝2.9×9+2.9×0.9＝26.1+2.61＝28.71

Answer 3

2.6x9.9=2.6x(1一0.1）=2.6×1-2.6×0.1=2.6-0.26=2.34

Answer 4

=2.6x(10-0.1)
=2.6x10-2.6x0.1
=26-0.26
=25.74

Answer 5

2.6×10-2.6×0.1

追答

25.74

等于

求采纳，打字不容易。

谢谢