题目内容
计算:12 |
27 |
2xy |
8y |
|
9a |
3
| ||
|
分析:先化简二次根式,再进行二次根式的乘法、加法运算即可.
解答:解:
•
=2
•3
=18;
•
=
=4y
;
a
+
-
=a×
+3
-
=
+3
-
=3
.
故答案为18;4y
;3
.
12 |
27 |
3 |
3 |
=18;
2xy |
8y |
2xy×8y |
=4y
x |
a
|
9a |
3
| ||
|
| ||
a |
a |
3
| ||
3 |
=
3a |
a |
3a |
=3
a |
故答案为18;4y
x |
a |
点评:本题考查了二次根式的混合运算,同类二次根式才能加减,注意系数相加,根号下面的数不变.
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