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	<title>学びあい &#187; 数学</title>
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		<title>最短距離は？</title>
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		<pubDate>Sat, 20 Oct 2012 15:18:00 +0000</pubDate>
		<dc:creator><![CDATA[Ken]]></dc:creator>
				<category><![CDATA[数学]]></category>

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		<title>2次関数（直線と放物線の交点[三角形の面積]）－６－</title>
		<link>http://www.manavi-i.info/Notebook/2012/10/602</link>
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		<pubDate>Sat, 20 Oct 2012 14:54:30 +0000</pubDate>
		<dc:creator><![CDATA[Ken]]></dc:creator>
				<category><![CDATA[数学]]></category>

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		<title>2次関数（直線と放物線の交点[三角形の面積]）－５－</title>
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		<comments>http://www.manavi-i.info/Notebook/2012/10/597#comments</comments>
		<pubDate>Sat, 20 Oct 2012 14:45:59 +0000</pubDate>
		<dc:creator><![CDATA[Ken]]></dc:creator>
				<category><![CDATA[数学]]></category>

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		<item>
		<title>2次関数（直線と放物線の交点[三角形の面積]）－４－</title>
		<link>http://www.manavi-i.info/Notebook/2012/10/594</link>
		<comments>http://www.manavi-i.info/Notebook/2012/10/594#comments</comments>
		<pubDate>Sat, 20 Oct 2012 14:39:49 +0000</pubDate>
		<dc:creator><![CDATA[Ken]]></dc:creator>
				<category><![CDATA[数学]]></category>

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		</item>
		<item>
		<title>2次関数（直線と放物線の交点[三角形の面積]）－３－</title>
		<link>http://www.manavi-i.info/Notebook/2012/10/591</link>
		<comments>http://www.manavi-i.info/Notebook/2012/10/591#comments</comments>
		<pubDate>Sat, 20 Oct 2012 14:34:04 +0000</pubDate>
		<dc:creator><![CDATA[Ken]]></dc:creator>
				<category><![CDATA[数学]]></category>

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		<title>2次関数（直線と放物線の交点[三角形の面積]）－２－</title>
		<link>http://www.manavi-i.info/Notebook/2012/10/586</link>
		<comments>http://www.manavi-i.info/Notebook/2012/10/586#comments</comments>
		<pubDate>Sat, 20 Oct 2012 14:25:02 +0000</pubDate>
		<dc:creator><![CDATA[Ken]]></dc:creator>
				<category><![CDATA[数学]]></category>

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		</item>
		<item>
		<title>2次関数（直線と放物線の交点[三角形の面積]）</title>
		<link>http://www.manavi-i.info/Notebook/2012/10/579</link>
		<comments>http://www.manavi-i.info/Notebook/2012/10/579#comments</comments>
		<pubDate>Sat, 20 Oct 2012 14:16:45 +0000</pubDate>
		<dc:creator><![CDATA[Ken]]></dc:creator>
				<category><![CDATA[数学]]></category>

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		<description><![CDATA[]]></description>
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		</item>
		<item>
		<title>2つの1次関数のグラフの関係</title>
		<link>http://www.manavi-i.info/Notebook/2012/08/565</link>
		<comments>http://www.manavi-i.info/Notebook/2012/08/565#comments</comments>
		<pubDate>Tue, 28 Aug 2012 03:02:31 +0000</pubDate>
		<dc:creator><![CDATA[Ken]]></dc:creator>
				<category><![CDATA[数学]]></category>

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		<description><![CDATA[角度や座標に注目して観察してみよう． &#160; &#160;]]></description>
				<content:encoded><![CDATA[<p>角度や座標に注目して観察してみよう．</p>
<p>&nbsp;</p>
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<p>&nbsp;</p>
]]></content:encoded>
			<wfw:commentRss>http://www.manavi-i.info/Notebook/2012/08/565/feed</wfw:commentRss>
		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>いろいろな1次関数のグラフを描こう</title>
		<link>http://www.manavi-i.info/Notebook/2012/08/551</link>
		<comments>http://www.manavi-i.info/Notebook/2012/08/551#comments</comments>
		<pubDate>Tue, 28 Aug 2012 01:44:57 +0000</pubDate>
		<dc:creator><![CDATA[Ken]]></dc:creator>
				<category><![CDATA[数学]]></category>

		<guid isPermaLink="false">http://www.manavi-i.info/Notebook/?p=551</guid>
		<description><![CDATA[\(a,~b\)の値を変化させて，気づいたことをメモしよう。 &#160; &#160;]]></description>
				<content:encoded><![CDATA[<p>\(a,~b\)の値を変化させて，気づいたことをメモしよう。</p>
<p>&nbsp;</p>
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<p>&nbsp;</p>
]]></content:encoded>
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		</item>
		<item>
		<title>1次関数の具体例</title>
		<link>http://www.manavi-i.info/Notebook/2012/08/539</link>
		<comments>http://www.manavi-i.info/Notebook/2012/08/539#comments</comments>
		<pubDate>Tue, 28 Aug 2012 01:34:13 +0000</pubDate>
		<dc:creator><![CDATA[Ken]]></dc:creator>
				<category><![CDATA[数学]]></category>

		<guid isPermaLink="false">http://www.manavi-i.info/Notebook/?p=539</guid>
		<description><![CDATA[それでは「一次関数」の具体例をみてみよう． 「1個100円の菓子を5個買って，袋に入れてくださいと言ったら袋代10円を取られました．」 を考える． このとき支払う金額は，1個100円の菓子5個で500円，それに袋代10円 [&#8230;]]]></description>
				<content:encoded><![CDATA[<div>それでは「一次関数」の具体例をみてみよう．<br />
「1個100円の菓子を5個買って，袋に入れてくださいと言ったら袋代10円を取られました．」</div>
<div>を考える．</div>
<div>このとき支払う金額は，1個100円の菓子5個で500円，それに袋代10円で，510円となる．<br />
では，1個買ったとき，2個買ったとき，・・・と考えて次のような表を考えてみよう．</div>
<div></div>
<div>
<table class="tdstyle">
<tbody align="center">
<tr>
<td>買った菓子の個数</td>
<td>1</td>
<td>2</td>
<td>3</td>
<td>4</td>
<td>5</td>
<td>6</td>
<td>7</td>
</tr>
<tr>
<td>支払う金額</td>
<td>110</td>
<td>210</td>
<td>310</td>
<td>410</td>
<td>510</td>
<td>610</td>
<td>710</td>
</tr>
</tbody>
</table>
<p>比例のときと違って，個数を100倍しても支払った金額にはならない．<br />
どのような関係があるか式を使って表せますか？</p>
</div>
<div>支払う金額には，菓子の個数に関係なく，袋代の10円が含まれています．<br />
だから，支払う金額は，</p>
<div>（支払う金額）＝100×（買った菓子の個数）＋10</div>
<p>になる．<br />
この式も，比例のときのように，「支払う金額」を\(y\)，「買った菓子の個数」を\(x\)として，\(y\)を\(x\)の式で表してみよう．</p>
<div>\[ y = 100x +10 \]</div>
<p>と表すことができる．<br />
\( y = 100x +10\) のように，<span style="color: #ff0000;">\(y\) <em>が \(x\)の</em><a title="多項式(Polynomial)" href="http://www.manavi-i.info/Notebook/2012/06/330"><span style="color: #ff0000;">一次式</span></a>で表される</span>とき，\(y\)<em>は\(x\)の</em><span style="color: #ff0000;">一次関数</span>であるという．</p>
</div>
]]></content:encoded>
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