Question

2.4ⅹ1.25x2.5？

怎么写

Answer 1

2.4×1.25×2.5
=(8×1.25)×(0.3×2.5)
=10×0.75
=7.5
用乘法结合律简算。

Answer 2

2.4×1.25×2.5
=8×0.3×1.25×2.5
=（8×1.25）×（0.3×2.5）
=10×0.75
=7.5

Answer 3

2.4×1.25×2.5
=(2×1.25+0.4×1.25)×2.5
=(2.5+0.5)×2.5
=3×2.5
=7.5

Answer 4

解：
2.4ⅹ1.25x2.5
=8x0.3x1.25x2.5
=（1.25x8）x（2.5x0.3）
=10x0.75
=7.5

Answer 5

只要注意到：
2.5乘以4,=10,
1.25乘以8,=10,
自己再把2.4分解一下。就可以啦！
或者先把原式子乘以8,再说，再除以8就方便。