Question

2.9×0.45+0.29x0.3简便计算？

Answer 1

2.9x0.45+0.29x0.3

＝0.29x4.5+0.29x0.3

＝0.29x（4.5+0.3）

＝0.29x4.8

＝（0.3-0.01）x4.8

＝0.3x4.8-0.01x4.8

＝1.44一0.048

＝1.392

Answer 2

2.9×0.45+0.29x0.3
=2.9×0.45+2.9×0.03
=2.9×（0.45+0.03）
=2.9×0.48
=1.392

Answer 3

简便计算： 2.9×0.45+0.29x0.3 = 0.29（4.5+0.3）= 0.29x4.8 = 1.392

Answer 4

回答：
2.9×0.45+0.29×0.3
=0.29×10×0.45+0.29×0.3
=0.29×（4.5+0.3）
=0.29×4.8
=（0.3-0.01）×4.8
=1.44-0.048
=1.4-0.008
=1.392
运用了乘法分配律

Answer 5

简便计算是直接提取公约2.9得
2.9x0.45+0.29x0.3
=2.9x(0.45+0.03)
=2.9x0.48
=(3-0.1)x0.48
=3x0.48-0.1x0.48
=1.44-0.048
=1.392