题目内容
| 用递等式计算. (1)1375+450÷18×25 | (2)168.1÷(4.3×2-0.4) | ||||||||||||
(3)
| (4)[1-(
|
(1)1375+450÷18×25,
=1375+25×25,
=1375+625,
=2000;
(2)168.1÷(4.3×2-0.4),
=168.1÷(8.6-0.4),
=168.1÷8.2,
=20.5;
(3)
÷
+
,
=
×10+
,
=
+
,
=
;
(4)[1-(
-
)]×
,
=[1-
+
]×
,
=
×
,
=
.
=1375+25×25,
=1375+625,
=2000;
(2)168.1÷(4.3×2-0.4),
=168.1÷(8.6-0.4),
=168.1÷8.2,
=20.5;
(3)
| 3 |
| 25 |
| 1 |
| 10 |
| 1 |
| 5 |
=
| 3 |
| 25 |
| 1 |
| 5 |
=
| 6 |
| 5 |
| 1 |
| 5 |
=
| 7 |
| 5 |
(4)[1-(
| 1 |
| 2 |
| 1 |
| 4 |
| 2 |
| 3 |
=[1-
| 1 |
| 2 |
| 1 |
| 4 |
| 2 |
| 3 |
=
| 3 |
| 4 |
| 2 |
| 3 |
=
| 1 |
| 2 |
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