来自陶英歌的问题
计算下面各题,怎样简便就怎样计算.4.7×3.8-14.563.2×9.96.73×5.8+4.2×6.73.
计算下面各题,怎样简便就怎样计算.
4.7×3.8-14.56
3.2×9.9
6.73×5.8+4.2×6.73.
1回答
2020-04-09 06:58
计算下面各题,怎样简便就怎样计算.4.7×3.8-14.563.2×9.96.73×5.8+4.2×6.73.
计算下面各题,怎样简便就怎样计算.
4.7×3.8-14.56
3.2×9.9
6.73×5.8+4.2×6.73.
(1)4.7×3.8-14.56,
=17.86-14.56,
=3.3;
(2)3.2×9.9,
=3.2×(10-0.1),
=3.2×10-3.2×0.1,
=32-0.32,
=31.68;
(3)6.73×5.8+4.2×6.73,
=6.73×(5.8+4.2),
=6.73×10,
=67.3.