用简便方法计算:0.25×0.03×4  
来源:学生作业帮 编辑:百度作业网作业帮 分类:数学作业 时间:2024/08/12 01:44:09
用简便方法计算:
0.25×0.03×4
10.1×78
21.2×5+18.8×5
6.3+0.84+3.7+8.16.
0.25×0.03×4
10.1×78
21.2×5+18.8×5
6.3+0.84+3.7+8.16.
![用简便方法计算:0.25×0.03×4  ](/uploads/image/z/15294315-3-5.jpg?t=%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97%EF%BC%9A0.25%C3%970.03%C3%974%26nbsp%3B%26nbsp%3B%26nbsp%3B%26nbsp%3B%26nbsp%3B%26nbsp%3B%26nbsp)
(1)0.25×0.03×4
=(0.25×4)×0.03
=1×0.03
=0.03
(2)10.1×78
=100×78+0.1×78
=7800+7.8
=7807.8
(3)21.2×5+18.8×5
=(21.2+18.8)×5
=40×5
=200
(4)6.3+0.84+3.7+8.16
=6.3+0.84+3.7+8.16
=(6.3+3.7)+(0.84+8.16)
=10+9
=19
=(0.25×4)×0.03
=1×0.03
=0.03
(2)10.1×78
=100×78+0.1×78
=7800+7.8
=7807.8
(3)21.2×5+18.8×5
=(21.2+18.8)×5
=40×5
=200
(4)6.3+0.84+3.7+8.16
=6.3+0.84+3.7+8.16
=(6.3+3.7)+(0.84+8.16)
=10+9
=19