下面各题,怎样简便就怎样算.
来源:学生作业帮 编辑:作业帮 分类:综合作业 时间:2024/10/06 15:18:01
下面各题,怎样简便就怎样算. 6.45-3.62+5.62 | 16.78-2.54+3.22-1.46 | 32×25 |
4200÷(50×7) | 58×23+23×42 | 101×53-53 |
(1)6.45-3.62+5.62
=6.45+(5.62-3.62)
=6.45+2
=8.45
(2)16.78-2.54+3.22-1.46
=(16.78+3.22)-(2.54+1.46)
=20-4
=16
(3)32×25
=8×(4×25)
=8×100
=800
(4)4200÷(50×7)
=4200÷7÷50
=600÷50
=12
(5)58×23+23×42
=(58+42)×23
=100×23
=2300
(6)101×53-53
=(101-1)×53
=100×53
=5300
=6.45+(5.62-3.62)
=6.45+2
=8.45
(2)16.78-2.54+3.22-1.46
=(16.78+3.22)-(2.54+1.46)
=20-4
=16
(3)32×25
=8×(4×25)
=8×100
=800
(4)4200÷(50×7)
=4200÷7÷50
=600÷50
=12
(5)58×23+23×42
=(58+42)×23
=100×23
=2300
(6)101×53-53
=(101-1)×53
=100×53
=5300