题目内容
计算:
(1)
•(3
-5
);
(2)(
-3xy+
)÷
;
(3)(2
-2)(3
-3);
(4)
-
÷(2+
).
(1)
| 1 |
| 2 |
| 10 |
| 15 |
| 6 |
(2)(
| x3y |
| xy3 |
| xy |
(3)(2
| 3 |
| 2 |
(4)
| 12 |
| 3 |
| 3 |
(1)原式=
×3
-
×5
=
-
=
-5
.
(2)原式=
÷
-3xy÷
+
÷
=x-3
+y.
(3)原式=2
×3
-2
×3-2×3
-2×3
+6
=6
-6
-6
+6.
(4)原式=
-
÷2-
÷
=2
-2
+3=3.
| 1 |
| 2 |
| 10 |
| 15 |
| 1 |
| 2 |
| 10 |
| 6 |
=
| 3 |
| 2 |
| 10×15 |
| 5 |
| 2 |
| 10×6 |
=
| 15 |
| 2 |
| 6 |
| 15 |
(2)原式=
| x3y |
| xy |
| xy |
| xy3 |
| xy |
=x-3
| xy |
(3)原式=2
| 3 |
| 2 |
| 3 |
| 2 |
| 2 |
=6
| 6 |
| 3 |
| 2 |
(4)原式=
| 12 |
| 3 |
| 3 |
| 3 |
=2
| 3 |
| 3 |
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