用递等式计算,能简算的简算
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:2024/07/07 19:49:48
用递等式计算,能简算的简算
(1)85×54÷18+745
(2)3.4÷[(1.25+0.45)×23]
(3)35×(1−
)÷
(1)85×54÷18+745
(2)3.4÷[(1.25+0.45)×23]
(3)35×(1−
3 |
7 |
5 |
12 |
![用递等式计算,能简算的简算](/uploads/image/z/1499864-32-4.jpg?t=%E7%94%A8%E9%80%92%E7%AD%89%E5%BC%8F%E8%AE%A1%E7%AE%97%EF%BC%8C%E8%83%BD%E7%AE%80%E7%AE%97%E7%9A%84%E7%AE%80%E7%AE%97)
(1)85×54÷18+745
=85×(54÷18)+745,
=85×3+745,
=255+745,
=1000;
(2)3.4÷[(1.25+0.45)×23]
=3.4÷(1.25+0.45)÷23,
=3.4÷1.7÷23,
=2÷23,
=
2
23;
(3)35×(1−
3
7)÷
5
12
=35×
4
7÷
5
12,
=20÷
5
12,
=48;
(4)(156×
4
13−26)×
8
11
=(48-26)×
8
11,
=22×
8
11,
=16;
(5)
7
8×
12
13+
7
8÷13
=
7
8×
12
13+
7
8×
1
13,
=
7
8×(
12
13+
1
13),
=
7
8.
=85×(54÷18)+745,
=85×3+745,
=255+745,
=1000;
(2)3.4÷[(1.25+0.45)×23]
=3.4÷(1.25+0.45)÷23,
=3.4÷1.7÷23,
=2÷23,
=
2
23;
(3)35×(1−
3
7)÷
5
12
=35×
4
7÷
5
12,
=20÷
5
12,
=48;
(4)(156×
4
13−26)×
8
11
=(48-26)×
8
11,
=22×
8
11,
=16;
(5)
7
8×
12
13+
7
8÷13
=
7
8×
12
13+
7
8×
1
13,
=
7
8×(
12
13+
1
13),
=
7
8.