Question

2.5乘0.64乘1.25（简便计算）？

点5×0点64×1点二五简便计算

Answer 1

2.5x0.64x1.25
=2.5x(0.8x0.8)x1.25
=(2.5x0.8)x(0.8x1.25)
=2x1
=2

Answer 2

2.5x（0.8x0.8）×1.25）＝2.5x0.8×（0...8x1.25）＝2

Answer 3

根据题意得：
2.5×0.64×1.25简便运算：
2.5×0.64×1.25
＝2.5×0.8×0.8×1.25
＝2.5×0.4×2×0.8×1.25
＝（2.5×0.4）×（0.8×1.25）×2
＝1×1×2
＝2

Answer 4

2.5*0.64*1.25
=25/10*64/100*125/100
=5/2*16/25*25/20
=5/2*16/20
=5/2*4/5
=2

Answer 5

2.5×0.64×1.25
=2.5×4×0.2×0.8×1.25
=（2.5×4）×（1.25×0.8）×0.2
=10×1×0.2
=10×0.2
=2