题目内容
计算:
①
×
÷
;
②
+
-
;
③2
+
-
-6
.
①
| 45 |
|
| 10 |
②
|
| 25x |
| 9x |
③2
| 27 |
| 45 |
| 20 |
|
(1)原式=
=
;
(2)原式=
+5
-3
=
;
(3)原式=6
+3
-2
-2
=4
+
.
45×
|
| 3 |
(2)原式=
| 3 |
| 2 |
| x |
| x |
| x |
| 7 |
| 2 |
| x |
(3)原式=6
| 3 |
| 5 |
| 5 |
| 3 |
| 3 |
| 5 |
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