题目内容
计算:
(1)(3
-4
)(3
+4
);
(2)
(2+
-
);
(3)(
-
+
)(
+
-
);
(4)(
-1)(
)2.
(1)(3
| ax |
| by |
| ax |
| by |
(2)
| 3 |
| 6 |
| 3 |
(3)(
| 2 |
| 3 |
| 5 |
| 2 |
| 3 |
| 5 |
(4)(
| 2 |
| 2+1 |
(1)(3
-4
)(3
+4
)=(3
)2-(4
)2=9ax-16by;
(2)
(2+
-
)=2
+3
-3;
(3)(
-
+
)(
+
-
)=(
)2-(
-
)2=2-3-5+2
=-6+2
;
(4)(
-1)(
)2=(
-1)×3=3
-3.
| ax |
| by |
| ax |
| by |
| ax |
| by |
(2)
| 3 |
| 6 |
| 3 |
| 3 |
| 2 |
(3)(
| 2 |
| 3 |
| 5 |
| 2 |
| 3 |
| 5 |
| 2 |
| 3 |
| 5 |
| 15 |
| 15 |
(4)(
| 2 |
| 2+1 |
| 2 |
| 2 |
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