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