题目内容
| 用递等式计算下面各题: 10÷
|
| ||||||||||||
(15-14×
| 21×(
|
(1)10÷
+
×4,
=10×
+
×4,
=18+
,
=18
;
(2)
×
+
×
,
=
×(
+
),
=
×1,
=
;
(3)(15-14×
)×
,
=(15-8)×
,
=7×
,
=
;
(4)21×(
+
),
=21×
+
×21,
=3+14,
=17.
| 5 |
| 9 |
| 1 |
| 6 |
=10×
| 9 |
| 5 |
| 1 |
| 6 |
=18+
| 2 |
| 3 |
=18
| 2 |
| 3 |
(2)
| 9 |
| 20 |
| 11 |
| 25 |
| 14 |
| 25 |
| 9 |
| 20 |
=
| 9 |
| 20 |
| 11 |
| 25 |
| 14 |
| 25 |
=
| 9 |
| 20 |
=
| 9 |
| 20 |
(3)(15-14×
| 4 |
| 7 |
| 8 |
| 21 |
=(15-8)×
| 8 |
| 21 |
=7×
| 8 |
| 21 |
=
| 8 |
| 3 |
(4)21×(
| 1 |
| 7 |
| 2 |
| 3 |
=21×
| 1 |
| 7 |
| 2 |
| 3 |
=3+14,
=17.
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