问题
解答题
用简便方法计算
3.5×0.7+5.5×0.7
6.2×9.9
4.8×0.25
0.125×3.2×0.25．
答案
（1）3.5×0.7+5.5×0.7
=（3.5+5.5）×0.7
=9×0.7
=63；
（2）6.2×9.9
=6.2×（10-0.1）
=6.2×10-6.2×0.1
=62-0.62
=61.38；
（3）4.8×0.25
=1.2×4×0.25
=1.2×（4×0.25）
=1.2×1
=1.2；
（4）0.125×3.2×0.25
=0.125×（0.8×4）×0.25
=（0.125×0.8）×（4×0.25）
=0.1×1
=0.1．