题目内容
计算求值
①(3
+
-2
)÷
②
-
-
+(
-2)0+
③先化简,再求值:
-
,其中x=
-3.
①(3
48 |
12 |
27 |
3 |
②
18 |
|
| ||||
|
3 |
(1-
|
③先化简,再求值:
3 |
x-3 |
18 |
x2-9 |
10 |
(1)原式=(12
+2
-6
)÷
=8
÷
=8;
(2)原式=3
-
-(1+
)+1+
-1
=
-1;
(3)原式=
-
=
=
=
,
当x=
-3时,原式=
=
.
3 |
3 |
3 |
3 |
3 |
3 |
(2)原式=3
2 |
3
| ||
2 |
2 |
2 |
=
3
| ||
2 |
(3)原式=
3 |
x-3 |
18 |
(x-3)(x+3) |
=
3(x+3)-18 |
(x-3)(x+3) |
=
3(x-3) |
(x-3)(x+3) |
=
3 |
x+3 |
当x=
10 |
3 | ||
|
3
| ||
10 |
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