用简便方法计算下面各题． 4.37×0.55+56.3×0.055； 2.5×1.6×1.25； 0.59×9.8； 53.6×38.2+536×6.08+53.6．

题目

用简便方法计算下面各题．
4.37×0.55+56.3×0.055；
2.5×1.6×1.25；
0.59×9.8；
53.6×38.2+536×6.08+53.6．

答案

（1）4.37×0.55+56.3×0.055
=43.7×0.055+56.3×0.055
=（43.7+56.3）×0.055
=100×0.055
=5.5
（2）2.5×1.6×1.25
=2.5×2×0.8×1.25
=（2.5×2）×（0.8×1.25）
=5×1
=5
（3）0.59×9.8
=0.59×（10-0.2）
=0.59×10-0.59×0.2
=5.9-0.118
=5.782
（4）53.6×38.2+536×6.08+53.6
=53.6×38.2+53.6×60.8+53.6
=53.6×（38.2+60.8+1）
=53.6×100
=5360