数学学习乐园讨论与解答（51―60） 标签：速算与巧算
<p><font face=" ,Arial">50</font></p><p><font face=" ,Arial">15</font></p><p><b><font face=" ,Arial">51</font></b><b><font face=" ,Arial">55</font></b></p><p><b><font face=" ,Arial"> </font></b></p><p><b><font face=" ,Arial">51</font></b></p><p><b><font face=" ,Arial"> </font></b></p><p><font face=" ,Arial">AB</font><font face=" ,Arial">A</font><font face=" ,Arial">D</font><font face=" ,Arial">DA</font><font face=" ,Arial">AB</font><font face=" ,Arial">DC</font></p><p><font face=" ,Arial">BC</font><font face=" ,Arial">AD</font><font face=" ,Arial">30</font></p><p><b><font face=" ,Arial">52</font></b><b><font face=" ,Arial">53</font></b></p><p><b><font face=" ,Arial"> </font></b></p><p><b><font face=" ,Arial">54</font></b></p><p><b><font face=" ,Arial"> </font></b></p><p><font face=" ,Arial">8</font></p><p><b><font face=" ,Arial">55</font></b></p><p><b><font face=" ,Arial"> </font></b></p><p><b><font face=" ,Arial">57</font></b></p><p><b><font face=" ,Arial"> </font></b></p><p><font face=" ,Arial">4</font></p><p><b><font face=" ,Arial"> </font></b></p><p><b><font face=" ,Arial">58</font></b></p><p><b><font face=" ,Arial"> </font></b></p><p><font face="宋体" lang="ZH-CN"></font></p><p><b><font face=" ,Arial"> </font></b></p><p><b><font face=" ,Arial">59</font></b></p><p><b><font face=" ,Arial"> </font></b></p><p><font face=" ,Arial">A</font><font face=" ,Arial">A</font><font face=" ,Arial">B</font><font face=" ,Arial">A</font><font face=" ,Arial">A</font><font face=" ,Arial">B</font><font face=" ,Arial">A</font><font face=" ,Arial">A</font><font face=" ,Arial">B</font><font face=" ,Arial">A</font><font face=" ,Arial">A</font><font face=" ,Arial">A</font></p><p><b><font face=" ,Arial">60</font></b></p><p><b><font face=" ,Arial"> </font></b></p><p><font face="宋体" lang="ZH-CN"></font></p><p><font face=" ,Arial">1</font><font face=" ,Arial">3km</font><font face=" ,Arial">3km</font><font face=" ,Arial">2</font><font face=" ,Arial">1.5km</font><font face=" ,Arial">3km</font></p>
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