题目内容
计算(化简):
①2
×
÷5
②5
-9
+
③(
-
)2011×(
+
)2012.
①2
| 12 |
| 1 |
| 4 |
| 3 |
| 2 |
②5
| 12 |
|
| 1 |
| 2 |
| 48 |
③(
| 3 |
| 2 |
| 3 |
| 2 |
①原式=2×
×
=
=
;
②原式=10
-3
+2
=9
;
③原式=(
-
)2011×(
+
)2011×(
+
)
=[(
-
)(
+
)]2011×(
+
)
=12011×(
+
)
=
+
.
| 1 |
| 4 |
| 1 |
| 5 |
12×3×
|
=
| 1 |
| 10 |
| 18 |
=
| 3 |
| 10 |
| 2 |
②原式=10
| 3 |
| 3 |
| 3 |
=9
| 3 |
③原式=(
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
=[(
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
=12011×(
| 3 |
| 2 |
=
| 3 |
| 2 |
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