题目内容
| 计算下面各题,怎样简便就怎样算. 15×
| 20×(
| ||||||||||||
| 10-(
|
(1)15×
÷
=
÷
=2
;
(2)20×(
+
-
)
=20×(
-
)
=20×
=6;
(3)
×
+
×
=
×(
+
)
=
×1
=
;
(4)10-(
+
×2)
=10-(
+
)
=10-2
=8.
| 3 |
| 8 |
| 9 |
| 4 |
=
| 45 |
| 8 |
| 9 |
| 4 |
=2
| 1 |
| 2 |
(2)20×(
| 2 |
| 5 |
| 1 |
| 6 |
| 4 |
| 15 |
=20×(
| 17 |
| 30 |
| 4 |
| 15 |
=20×
| 3 |
| 10 |
=6;
(3)
| 3 |
| 5 |
| 7 |
| 13 |
| 3 |
| 5 |
| 6 |
| 13 |
=
| 3 |
| 5 |
| 7 |
| 13 |
| 6 |
| 13 |
=
| 3 |
| 5 |
=
| 3 |
| 5 |
(4)10-(
| 4 |
| 3 |
| 1 |
| 3 |
=10-(
| 4 |
| 3 |
| 2 |
| 3 |
=10-2
=8.
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