题目内容
计算
(1)
(2)(
+
)÷
(3)(-
)-2+(
)0+(-5)3÷(-5)2.
(1)
| x2+2xy+y2 |
| x2-y2 |
(2)(
| 4 |
| x2-4 |
| 1 |
| x+2 |
| 1 |
| x-2 |
(3)(-
| 1 |
| 2 |
| 1 |
| 19 |
(1)原式=
=
;
(2)原式=
×(x-2)=
×(x-2)=1;
(3)原式=4+1-5=0.
| (x+y)2 |
| (x+y)(x-y) |
| x+y |
| x-y |
(2)原式=
| 4+x-2 |
| (x+2)(x-2) |
| 1 |
| x-2 |
(3)原式=4+1-5=0.
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