题目内容
计算题.
(1)
(2)4
+
-
+4
(3)(
+1)(2-
)
(4)(
+1)2-2
.
(1)
| (-144)×(-169) |
(2)4
| 5 |
| 45 |
| 8 |
| 2 |
(3)(
| 2 |
| 2 |
(4)(
| 3 |
| 48 |
(1)
=
=
×
=12×13
=276;
(2)4
+
-
+4
=4
+3
-2
+4
=7
+2
;
(3)(
+1)(2-
)
=2
-(
)2+2-
=2
-2+2-
=
;
(4)(
+1)2-2
=(
)2+2
+1-8
=3+2
+1-8
=4-6
.
| (-144)×(-169) |
=
| 144×169 |
=
| 144 |
| 169 |
=12×13
=276;
(2)4
| 5 |
| 45 |
| 8 |
| 2 |
=4
| 5 |
| 5 |
| 2 |
| 2 |
=7
| 5 |
| 2 |
(3)(
| 2 |
| 2 |
=2
| 2 |
| 2 |
| 2 |
=2
| 2 |
| 2 |
=
| 2 |
(4)(
| 3 |
| 48 |
=(
| 3 |
| 3 |
| 3 |
=3+2
| 3 |
| 3 |
=4-6
| 3 |
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