Question

【題目】用簡便方法計(jì)算下列各題
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寫成0.9×4，再根據(jù)乘法結(jié)合律進(jìn)行簡算；②根據(jù)乘法分配律進(jìn)行簡算；③根據(jù)乘法交換律和結(jié)合律進(jìn)行簡算；④根據(jù)除法性質(zhì)進(jìn)行簡算．