题目内容
2.5×0.8×2.5×3.2=2.5×（0.8+3.2）
×
×
（判断对错）分析：在计算2.5×0.8×2.5×3.2时，把0.8看作0.4×2，把3.2看作4×0.8，然后运用运算定律进行简算．而2.5×0.8×2.5×3.2=2.5×（0.8+3.2）错用了运算定律．
解答：解：2.5×0.8×2.5×3.2，
=2.5×0.4×2×2.5×4×0.8，
=（2.5×0.4）×（2.5×4）×0.8×2；
而原题错用了乘法分配律，因此，原题错误．
故答案为：×．
=2.5×0.4×2×2.5×4×0.8，
=（2.5×0.4）×（2.5×4）×0.8×2；
而原题错用了乘法分配律，因此，原题错误．
故答案为：×．
点评：解答此题，应注意分析数据，正确运用运算定律简算．
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