Question

2.5x3.2x4用简便方法

Answer 1

2.5×3.2×4
＝〈2.5×（3＋0.2）〉×4
＝〈2.5×3＋2.5×0.2〉×4
＝〈7.5＋0.5〉×4
＝8×4
＝32

Answer 2

2.5x3.2ⅹ4
=2.5x4x3.2
=10x3.2
=32