数学学习乐园讨论与解答（31―40） 标签：速算与巧算
<p><font face=" ,Arial">32</font></p><p><font face=" ,Arial">16</font><font face=" ,Arial">4</font><font face=" ,Arial">2023</font></p><p><b><font face=" ,Arial">33</font></b></p><p><b><font face=" ,Arial"> </font></b></p><p><b><font face=" ,Arial"> </font></b></p><p><b><font face=" ,Arial">34</font></b></p><p><b><font face=" ,Arial"> </font></b></p><p><font face=" ,Arial">1cm</font><font face=" ,Arial">3</font><font face=" ,Arial">3</font><font face=" ,Arial">8</font><font face=" ,Arial">2cm</font><font face=" ,Arial">2cm</font></p><p><font face=" ,Arial">3cm</font><font face=" ,Arial">27</font><font face=" ,Arial">1cm</font><font face=" ,Arial">27</font><font face="宋体" lang="ZH-CN">×</font><font face=" ,Arial">6</font><font face=" ,Arial">3</font><font face=" ,Arial">3cm</font><font face=" ,Arial">3</font><font face="宋体" lang="ZH-CN">×</font><font face=" ,Arial">6</font><font face=" ,Arial">9</font></p><p><font face=" ,Arial">3cm</font><font face=" ,Arial">4</font></p><p><font face=" ,Arial">6</font><font face=" ,Arial">R</font><font face=" ,Arial" size="2">2</font><font face=" ,Arial">B</font><font face=" ,Arial" size="2">2</font><font face=" ,Arial">Y</font><font face=" ,Arial" size="2">2</font></p><p><font face=" ,Arial">3</font><font face=" ,Arial">R</font><font face=" ,Arial" size="2">3</font><font face=" ,Arial">B</font><font face=" ,Arial" size="2">2</font><font face=" ,Arial">Y</font><font face=" ,Arial" size="2">1</font></p><p><font face=" ,Arial">3</font><font face=" ,Arial">R</font><font face=" ,Arial" size="2">3</font><font face=" ,Arial">B</font><font face=" ,Arial" size="2">1</font><font face=" ,Arial">Y</font><font face=" ,Arial" size="2">2</font></p><p><font face=" ,Arial">3</font><font face=" ,Arial">R</font><font face=" ,Arial" size="2">2</font><font face=" ,Arial">B</font><font face=" ,Arial" size="2">3</font><font face=" ,Arial">Y</font><font face=" ,Arial" size="2">1</font></p><p><font face=" ,Arial">3</font><font face=" ,Arial">R</font><font face=" ,Arial" size="2">1</font><font face=" ,Arial">B</font><font face=" ,Arial" size="2">3</font><font face=" ,Arial">Y</font><font face=" ,Arial" size="2">2</font></p><p><font face=" ,Arial">3</font><font face=" ,Arial">R</font><font face=" ,Arial" size="2">2</font><font face=" ,Arial">B</font><font face=" ,Arial" size="2">1</font><font face=" ,Arial">Y</font><font face=" ,Arial" size="2">3</font></p><p><font face=" ,Arial">3</font><font face=" ,Arial">R</font><font face=" ,Arial" size="2">1</font><font face=" ,Arial">B</font><font face=" ,Arial" size="2">2</font><font face=" ,Arial">Y</font><font face=" ,Arial" size="2">3</font></p><p><font face=" ,Arial">1</font><font face=" ,Arial">R</font><font face=" ,Arial" size="2">3</font><font face=" ,Arial">B</font><font face=" ,Arial" size="2">3</font><font face=" ,Arial"> B</font><font face=" ,Arial" size="2">3</font><font face=" ,Arial">Y</font><font face=" ,Arial" size="2">3</font><font face=" ,Arial"> Y</font><font face=" ,Arial" size="2">3</font><font face=" ,Arial">R</font><font face=" ,Arial" size="2">3</font><font face=" ,Arial">(</font><font face=" ,Arial">)</font></p><p><font face=" ,Arial">R</font><font face=" ,Arial">B</font><font face=" ,Arial">Y</font><font face=" ,Arial">2</font><font face=" ,Arial">3</font></p><p><b><font face=" ,Arial"> </font></b></p><p><b><font face=" ,Arial">35</font></b></p><p><b><font face=" ,Arial"> </font></b></p><p><font face=" ,Arial">Aa</font><font face=" ,Arial">Bb</font><font face=" ,Arial">Cc</font><font face="宋体" lang="ZH-CN">琛ㄧず</font><font face=" ,Arial">3</font></p><p><font face=" ,Arial">3</font><font face=" ,Arial">5</font></p><p><font face=" ,Arial">3</font><font face=" ,Arial">abc</font><font face=" ,Arial">a</font><font face=" ,Arial">3</font><font face=" ,Arial">ABC</font><font face=" ,Arial">a</font><font face=" ,Arial">A</font></p><p><font face=" ,Arial">5</font><font face=" ,Arial">13</font></p><p><font face=" ,Arial">3</font><font face=" ,Arial">abc</font><font face=" ,Arial">a</font><font face=" ,Arial">A</font><font face=" ,Arial">A</font><font face=" ,Arial">(</font><font face=" ,Arial">b</font><font face=" ,Arial">c</font><font face=" ,Arial">A</font><font face=" ,Arial">)</font><font face=" ,Arial">ABC</font><font face=" ,Arial">Aa</font><font face=" ,Arial">Bb</font><font face=" ,Arial">Cc</font><font face=" ,Arial">ADE</font><font face=" ,Arial">3</font><font face=" ,Arial">A</font><font face=" ,Arial">D</font><font face=" ,Arial">E</font></p><p><b><font face=" ,Arial">36</font></b></p><p><font face=" ,Arial">A</font><font face=" ,Arial">B</font><font face=" ,Arial">40m</font></p><p><b><font face=" ,Arial"> </font></b></p><p><b><font face=" ,Arial">37</font></b></p><p><b></b></p><p><b><font face=" ,Arial"> </font></b></p><p><b><font face=" ,Arial">8</font></b></p><p><font face=" ,Arial">3</font><font face="宋体" lang="ZH-CN">×</font><font face=" ,Arial">3</font><font face=" ,Arial">4</font><font face="宋体" lang="ZH-CN">×</font><font face=" ,Arial">2</font><font face=" ,Arial">1</font></p><p><font face=" ,Arial">5</font><font face="宋体" lang="ZH-CN">×</font><font face=" ,Arial">1</font><font face=" ,Arial">4</font><font face="宋体" lang="ZH-CN">×</font><font face=" ,Arial">2</font><font face=" ,Arial">3</font><font face="宋体" lang="ZH-CN">×</font><font face=" ,Arial">3</font><font face=" ,Arial">3</font><font face=" ,Arial">4</font><font face=" ,Arial">5</font><font face=" ,Arial">12</font><font face=" ,Arial">2</font></p><p><font face=" ,Arial">12</font><font face=" ,Arial">12</font><font face=" ,Arial">3</font></p><p><b><font face=" ,Arial">39</font></b><b><font face=" ,Arial">40</font></b></p><p><font face="宋体" lang="ZH-CN"></font></p><p><font face=" ,Arial">(</font><font face=" ,Arial">)</font><font face=" ,Arial">180</font></p>
页:
[1]