题目内容
简便运算
(1)18×(
| (2)
| (3)3-
| (4)
|
(1)18×(
+
),
=18×
+
×18,
=8+15,
=23;
(2)
×7+
×5,
=
×(7+5),
=
×12,
=8;
(3)3-
-
,
=3-(
+
),
=3-1,
=2;
(4)
×
+
×
,
=
×(
+
),
=
×1,
=
.
| 4 |
| 9 |
| 5 |
| 6 |
=18×
| 4 |
| 9 |
| 5 |
| 6 |
=8+15,
=23;
(2)
| 2 |
| 3 |
| 2 |
| 3 |
=
| 2 |
| 3 |
=
| 2 |
| 3 |
=8;
(3)3-
| 7 |
| 12 |
| 5 |
| 12 |
=3-(
| 7 |
| 12 |
| 5 |
| 12 |
=3-1,
=2;
(4)
| 5 |
| 7 |
| 3 |
| 8 |
| 5 |
| 8 |
| 5 |
| 7 |
=
| 5 |
| 7 |
| 3 |
| 8 |
| 5 |
| 8 |
=
| 5 |
| 7 |
=
| 5 |
| 7 |
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