题目内容
计算
①
-
-
+
②
(-
)÷(
).
①
| 27 |
| 45 |
| 20 |
| 75 |
②
| 1 |
| 3 |
| x2y |
| 1 |
| 4 |
|
| 1 |
| 6 |
| x2y |
(1)原式=3
-3
-2
+5
=8
-5
;
(2)原式=
×(-
)×6×
=-
=-
.
| 3 |
| 5 |
| 5 |
| 3 |
=8
| 3 |
| 5 |
(2)原式=
| 1 |
| 3 |
| 1 |
| 4 |
x2y•
|
=-
| 1 |
| 2 |
|
=-
| y |
| 2x |
| x |
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