Question

1.29x6.4+4.6x1.29-1.29的简便计算方法？

Answer 1

1.29×6.4+1.29=4.6－1.29
=1.29×（6.4+4.6－1）
=1.29×10
=12.9

Answer 2

1.29x6.4+4.6x1.29-1.29
=1.29x(6.4+4.6-1)
=1.29x10
=12.9

Answer 3

1.29×6.4+4.6×1.29-1.29
=(6.4+4.6-1)×1.29
=10×1.29
=12.9

Answer 4

1.29×6.4+1.29×4.6-1.29
=1.29×（6.4+4.6-1）
=1.29×（11-1）
=12.9

Answer 5

原式＝1.29×（6.4+4.6-1）
＝1.29×10
＝12.9