题目内容
计算或化简:(1)
| 32 |
| 18 |
|
(2)(
| 18 |
| 3 |
|
|
(3)(3
| 18 |
| 1 |
| 5 |
| 50 |
|
| 32 |
| 32 |
(4)(
| 2 |
| 3 |
| 3 |
| 6 |
| 8 |
分析:按照实数的运算法则依次计算,把除法转化为乘法,先进行括号内的加减法,再进行括号外的乘法.
解答:解:(1)
+
-5
=4
+3
-
=
;
(2)(
+
)-(2
-
)=(3
+
)-(
-
)=2
+
;
(3)(3
+
-4
)÷
=(9
+
-2
)×
=8
×
=2;
(4)(
-1)2+
(
-
)+
=3-2
+3-3
+2
=6-3
.
| 32 |
| 18 |
|
| 2 |
| 2 |
5
| ||
| 2 |
| 9 |
| 2 |
| 2 |
(2)(
| 18 |
| 3 |
|
|
| 2 |
| 3 |
| 2 |
| ||
| 3 |
| 2 |
| 4 |
| 3 |
| 3 |
(3)(3
| 18 |
| 1 |
| 5 |
| 50 |
|
| 32 |
=(9
| 2 |
| 2 |
| 2 |
| 1 | ||
4
|
=8
| 2 |
| 1 | ||
4
|
=2;
(4)(
| 2 |
| 3 |
| 3 |
| 6 |
| 8 |
=3-2
| 2 |
| 2 |
| 2 |
=6-3
| 2 |
点评:本题考查二次根式的化简,解答此题,要二次根式的加减法则,混合运算法则,去括号法则.
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