Question

2.9×0.45+0.29×4.3+0.029×13 的简便运算三种方法一共有多少？

Answer 1

2.9×0.45＋0.29×4.3＋0.029×13
＝2.9×0.45＋2.9×0.43＋2.9×0.13
＝2.9×（0.45＋0.43＋0.13）
＝2.9×1
＝2.9
2.9×0.45＋0.29×4.3＋0.029×13
＝0.29×4.5＋0.29×4.3＋0.29×1.3
＝0.29×（4.5＋4.3＋1.3）
＝0.29×10
＝2.9

Answer 2

2.9×0.45+0.29×4.3+0.029×13
=2.9×0.45+0.29×4.3+0.029×13
=0.29×4.5+0.29×4.3+0.29×1.3
=0.29×(4.5+4.3+1.3)
=0.29×(10+0.1)
=0.29×10+0.29×0.1
=2.9+0.029
=2.929

Answer 3

对于智能在运算感知方面可能有长处在认知情感方面还等研究