Question

2.5ⅹ4.12－0.25ⅹ1.2的简便计算？

Answer 1

2.5ⅹ4.12－0.25ⅹ1.2的简便计算？
先提取公约数0.25后再计算较为简单：
2.5ⅹ4.12－0.25ⅹ1.2
=0.25*10*4.12-0.25*1.2
=0.25*41.2-0.25*1.2
=0.25*（41.2-1.2）
=0.25*40
=10

Answer 2

2.5*4.12-0.25*1.2
=0.25*41.2-0.25*1.2
=（41.2-1.2）*0.25
=40*0.25=10

Answer 3

2.5ⅹ4.12－0.25ⅹ1.2
=0.25ⅹ41.2－0.25ⅹ1.2
=0.25ⅹ(41.2－1.2)
=0.25ⅹ40
=10

Answer 4

解: 2.5x4.12-0.25x1.2
＝0.25x(10x4.12-1x1.2)
＝0.25x(41.2-1.2)
＝0.25x40
＝10

Answer 5

2.5×4.12-0.25×1.2
=（4.12-1.2）×2.5×100
=25×0.4
＝10