简便计算8.59+2.57+3.43+5.47;
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/02 23:28:16
简便计算
8.59+2.57+3.43+5.47;
301×79;
125×72×8;
1280÷16÷8.
8.59+2.57+3.43+5.47;
301×79;
125×72×8;
1280÷16÷8.
![简便计算8.59+2.57+3.43+5.47;](/uploads/image/z/2069165-29-5.jpg?t=%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%978.59%2B2.57%2B3.43%2B5.47%EF%BC%9B%26nbsp%3B%26nbsp%3B%26nbsp%3B%26nbsp%3B%26nbsp%3B%26nbsp%3B)
(1)8.59+2.57+3.43+5.47
=(8.59+5.47)+(2.57+3.43)
=14.06+6
=20.06
(2)301×79
=(300+1)×79
=300×79+79
=23700+79
=23779
(3)125×72×8
=125×8×72
=1000×72
=72000
(4)1280÷16÷8
=1280÷(16×8)
=1280÷128
=10
=(8.59+5.47)+(2.57+3.43)
=14.06+6
=20.06
(2)301×79
=(300+1)×79
=300×79+79
=23700+79
=23779
(3)125×72×8
=125×8×72
=1000×72
=72000
(4)1280÷16÷8
=1280÷(16×8)
=1280÷128
=10