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		<h2 class="pull-left">Bài Kiểm Tra</h2>
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		<h1>Giải vở bài tập Toán 5, Bài 50. Tổng nhiều số thập phân</h1>
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			<li>Thứ ba - 01/10/2019 11:38</li>
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			Hướng dẫn: Giải vở bài tập Toán 5, Bài 50. Tổng nhiều số thập phân
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			<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>1. Đặt tính rồi tính: </b></span></span></span><br  />
<img alt="hay dat tinh roi tinh" height="95" src="https://baikiemtra.com/uploads/news/2019_10/hay-dat-tinh-roi-tinh.jpg" width="500" /><br  />
<br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>2. Viết tiếp vào chỗ chấm cho thích hợp:</b></span></span></span>
<table class="MsoTableGrid" style="border-collapse:collapse; border:solid windowtext 1.0pt">
	<tbody>
		<tr>
			<td style="border:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt" valign="top"><span style="font-size:14pt"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif">a</span></span></span></td>
			<td style="border:solid windowtext 1.0pt; border-left:none; padding:0cm 5.4pt 0cm 5.4pt" valign="top"><span style="font-size:14pt"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif">b</span></span></span></td>
			<td style="border:solid windowtext 1.0pt; border-left:none; padding:0cm 5.4pt 0cm 5.4pt" valign="top"><span style="font-size:14pt"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif">c</span></span></span></td>
			<td style="border:solid windowtext 1.0pt; border-left:none; padding:0cm 5.4pt 0cm 5.4pt" valign="top"><span style="font-size:14pt"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif">(a + b) + c</span></span></span></td>
			<td style="border:solid windowtext 1.0pt; border-left:none; padding:0cm 5.4pt 0cm 5.4pt" valign="top"><span style="font-size:14pt"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif">a + (b + c)</span></span></span></td>
		</tr>
		<tr>
			<td style="border:solid windowtext 1.0pt; border-top:none; padding:0cm 5.4pt 0cm 5.4pt" valign="top"><span style="font-size:14pt"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif">7,9</span></span></span></td>
			<td style="border-bottom:solid windowtext 1.0pt; border-top:none; border-left:none; border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt" valign="top"><span style="font-size:14pt"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif">3,8</span></span></span></td>
			<td style="border-bottom:solid windowtext 1.0pt; border-top:none; border-left:none; border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt" valign="top"><span style="font-size:14pt"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif">2,2</span></span></span></td>
			<td style="border-bottom:solid windowtext 1.0pt; border-top:none; border-left:none; border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt" valign="top"><span style="font-size:14pt"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif">(7,9 + 3,8) + 2,2 = 13,9</span></span></span></td>
			<td style="border-bottom:solid windowtext 1.0pt; border-top:none; border-left:none; border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt" valign="top"><span style="font-size:14pt"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif">7,9 + (3,8 + 2,2) = 13,9</span></span></span></td>
		</tr>
		<tr>
			<td style="border:solid windowtext 1.0pt; border-top:none; padding:0cm 5.4pt 0cm 5.4pt" valign="top"><span style="font-size:14pt"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif">5,41</span></span></span></td>
			<td style="border-bottom:solid windowtext 1.0pt; border-top:none; border-left:none; border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt" valign="top"><span style="font-size:14pt"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif">2,56</span></span></span></td>
			<td style="border-bottom:solid windowtext 1.0pt; border-top:none; border-left:none; border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt" valign="top"><span style="font-size:14pt"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif">0,44</span></span></span></td>
			<td style="border-bottom:solid windowtext 1.0pt; border-top:none; border-left:none; border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt" valign="top"><span style="font-size:14pt"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif">(5,41 + 2,56) + 0,44 = 8,41</span></span></span></td>
			<td style="border-bottom:solid windowtext 1.0pt; border-top:none; border-left:none; border-right:solid windowtext 1.0pt; padding:0cm 5.4pt 0cm 5.4pt" valign="top"><span style="font-size:14pt"><span style="line-height:normal"><span style="font-family:&#039;Times New Roman&#039;,serif">5,41 + (2,56 + 0,44) = 8,41</span></span></span></td>
		</tr>
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</table>
<br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><u>Nhận xét:</u> (a + b) + c = a + (b+ c)</span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><i>Phép cộng các số thập phân có tính chất kết hợp: Khi cộng một tổng hai số với số thứ ba, ta có thể cộng số thứ nhất với tổng của hai số còn lại.</i></span></span></span><br  />
<br  />
<span style="font-size:14pt"><span style="line-height:115%"><span style="font-family:&#039;Times New Roman&#039;,serif"><b>3. Sử dụng tính chất giao hoán và tính chất kết hợp để tính:</b></span></span></span><br  />
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