题目内容
(1)(x+3)(x-2)-(x-2)2
(2)(3x+4y)(3x-4y)
(3)
-
+2
(4)60
×59
.
(2)(3x+4y)(3x-4y)
(3)
| 25 |
| 3 | 8 |
|
(4)60
| 1 |
| 3 |
| 2 |
| 3 |
(1)原式=x2-2x+3x-6-(x2-4x+4)=x2+x-6-x2+4x-4=5x-10;
(2)原式=9x2-16y2;
(3)原式=5-2+2×
=3+1=4;
(4)原式=(60+
)(60-
)=3600-
=3599
.
(2)原式=9x2-16y2;
(3)原式=5-2+2×
| 1 |
| 2 |
(4)原式=(60+
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 9 |
| 8 |
| 9 |
练习册系列答案
相关题目