题目内容
计算下列各题:
(1)(-a)7÷(-a)4×(-a)3
(2)(x+
)2
(3)x(y-5)+y(3-x);
(4)
+
+
.
(1)(-a)7÷(-a)4×(-a)3
(2)(x+
| 1 |
| 2 |
(3)x(y-5)+y(3-x);
(4)
| 3 | 4+
| ||
| 3 |
| ||
(
|
(1)原式=-a;
(2)原式=x2+x+
;
(3)原式=xy-5x+3y-xy=-5x+3y;
(4)原式=
+
+
=
-
+
=
.
(2)原式=x2+x+
| 1 |
| 4 |
(3)原式=xy-5x+3y-xy=-5x+3y;
(4)原式=
| 3 |
| ||
| 3 | -
| ||
|
| 5 |
| 3 |
| 3 |
| 4 |
| 3 |
| 2 |
| 29 |
| 12 |
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