作业帮 > 数学 > 作业

2.5×1.7×0.4,4.8-4.8×0.5,7.09×10.8×7.09 简便运算

来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/06 00:20:52
2.5×1.7×0.4,4.8-4.8×0.5,7.09×10.8×7.09 简便运算
能简便就简便!
2.5×1.7×0.4
=2.5×0.4×1.7
=1×1.7
=1.7
4.8-4.8×0.5
=4.8×(1-0.5)
=4.8×0.5
=2.4
7.09×10.8-7.09
=7.09×(10.8-1)
=7.09×(10-0.2)
=7.09×10-7.09×0.2
=70.9-1.418
=69.482