Question

【题目】用简便方法计算下列各题
3.6×0.25
99×1.83+1.83
12.5×0.78×0.8
3.67÷0.25÷40．

Answer 1

【答案】解：①3.6×0.25
=0.9×4×0.25
=0.9×（4×0.25）
=0.9×1
=0.9
②99×1.83+1.83
=1.83×（99+1）
=1.83×100
=183
③12.5×0.78×0.8
=12.5×0.8×0.78
=10×0.78
=7.8
④3.67÷0.25÷40
=3.67÷（0.25×40）
=3.67÷10
=0.367
【解析】①把3.6写成0.9×4，再根据乘法结合律进行简算；②根据乘法分配律进行简算；③根据乘法交换律和结合律进行简算；④根据除法性质进行简算．