题目内容
计算题
(1)(a+4)(a-4)-(a-5)2
(2)(a-3b-3)(a-3b+3)
(3)
-
•
.
(1)(a+4)(a-4)-(a-5)2
(2)(a-3b-3)(a-3b+3)
(3)
| 1 |
| x+1 |
| 1 |
| x2-1 |
| x2-2x+1 |
| x+1 |
(1)原式=a2-16-(a2-10a+25)
=a2-16-a2+10a-25
=10a-41;
(2)原式=(a-3b-3)(a-3b+3)
=(a-3b)2-9
=a2-6b+9b2-9;
(3)原式=
-
•
=
=
.
=a2-16-a2+10a-25
=10a-41;
(2)原式=(a-3b-3)(a-3b+3)
=(a-3b)2-9
=a2-6b+9b2-9;
(3)原式=
| 1 |
| x+1 |
| 1 |
| (x+1)(x-1) |
| (x-1)2 |
| x+1 |
=
| x+1-(x-1) |
| (x+1)2 |
=
| 2 |
| (x+1)2 |
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