题目内容
(1)先化简,再求值:(x-
)÷(1+
),其中x=
+1
(2)计算:-32+(-3)-2+(2×106)×(1×10-5)+(π-3)0.
| x |
| x+1 |
| 1 |
| x2-1 |
| 2 |
(2)计算:-32+(-3)-2+(2×106)×(1×10-5)+(π-3)0.
(1)原式=
÷
=
•
=x-1,
将x=
+1时,原式=
+1-1=
;
(2)原式=-9+
+2×10+1=12
.
| x2 |
| x+1 |
| x2 |
| x2-1 |
| x2 |
| x+1 |
| (x+1)(x-1) |
| x2 |
将x=
| 2 |
| 2 |
| 2 |
(2)原式=-9+
| 1 |
| 9 |
| 1 |
| 9 |
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