题目内容
根据如图拼图的启示:
(1)计算
+
=______;
(2)计算
+
=______;
(3)计算
+
=______.
解:(1)由图形可得:
+
=3
;
(2)
+
=6
;
(3)
+
=12
.
分析:(1)根据图形可得
+
为三个小正方形的边长.
(2)
+
=两个小正方形的边长+4个小正方形的边长.
(3)4个小正方形的边长+8个小正方形的边长.
点评:本题考查二次根式的加减运算,难度不大,注意理解图形的含义.
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(2)
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(3)
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分析:(1)根据图形可得


(2)
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
(3)4个小正方形的边长+8个小正方形的边长.
点评:本题考查二次根式的加减运算,难度不大,注意理解图形的含义.

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