meili 发表于 2022-10-21 20:42:24

2023年第十七届华杯赛决赛试题答案解析A卷(小中组) 标签:华杯赛

<p><strong>第十七届华罗庚金杯少年数学邀请赛</strong> </p><p><strong>决赛笔试试题A参考答案</strong> </p><p><strong>(小学中年级组)</strong> </p><p><strong>一、填空</strong>(每题10分,共80分)</p><p><table align="center"><tbody><tr><td width="50"><strong>题号</strong> </td><td width="50">1</td><td width="50">2</td><td width="50">3</td><td width="50">4</td><td width="50">5</td><td width="50">6</td><td width="50">7</td><td width="50">8</td></tr><tr><td width="50"><strong>答案</strong> </td><td width="50">48</td><td width="50">144</td><td width="50">120</td><td width="50">15</td><td width="50">11</td><td width="50">6</td><td width="50">7</td><td width="50">26</td></tr></tbody></table></p><p><strong>二、解答下列各题</strong>(每题15分,共60分,要求写出简要过程)</p><p>9、答案:1</p><p>10、答案:200</p><p>11、答案:112</p><p>12、答案:7,61</p><p><strong>试题详解</strong> </p><p>1.<strong>【解析】</strong>:36×2/3×2=48平方厘米</p><p>2.<strong>【解析】</strong>:8×9×2=144</p><p>3.<strong>【解析】</strong>:80×3/2=120分</p><p>4.<strong>【解析】</strong>:3×17-36=15</p><p>5.<strong>【解析】</strong>:3x+2y+z=66</p><p>y=x+2</p><p>5x+z=62</p><p>3x<=66/2 x<=11</p><p>x=11 z=7 y=13</p><p>6.<strong>【解析】</strong>:标数2+2+2=6</p><p>7.<strong>【解析】</strong>:车队长=115×4-298=162米</p><p>162=6n+(n-1)×20</p><p>n=7辆</p><p>8.<strong>【解析】</strong>:(长+宽)×6+36=114</p><p>长+宽=13</p><p>周长=26厘米</p><p>9.<strong>【解析】</strong>:x+y=25</p><p>y+z=13</p><p>x-z=12</p><p>x<=13</p><p>z=1</p><p>10.<strong>【解析】</strong>:40×5=200</p><p>11.<strong>【解析】</strong>:1×4+2×3×2+2×2=20</p><p>132-20=112</p><p>12.<strong>【解析】</strong>:构造法 8 8 8 8 8 8 8</p><p>63/8=7...7</p><p>7张</p><p><span></span>x+2<=63 x<=61</p><p> </p>
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