数学题目 求第二个问题答案 数学题目不会做，求解答
\u6c42\u6570\u5b66\u9898\u76ee\u7b54\u6848\uff08\u5c31\u4e24\u9053\u9898\u62dc\u6258\uff0c\u62dc\u6258\uff091. \u5c0f\u971e\u7b2c\u516d\u5355\u5143\u7684\u6d4b\u8bd5\u6210\u7ee9\u6bd4\u7b2c\u4e94\u5355\u5143\u63d0\u9ad8\u4e8610%\uff0c\u7b2c\u516d\u5355\u5143\u7684\u6d4b\u8bd5\u6210\u7ee9\u76f8\u5f53\u4e8e\u7b2c\u4e94\u5355\u5143\u7684\uff08110\uff09%
2.5/\uff0810\uff09=\uff081\uff09:\uff084\uff09=\uff0880\uff09\u5206\u4e4b20=\uff0825\uff09%
\u7b2c\u4e00\u4e2a\u3002
1\u3002\u5df2\u77e5\u5e95\u9762\u79ef12\u300256m\uff08\u5e73\u65b9\uff09\uff1b\u9ad8\uff1a13dm=1.3m
2\u3002\u6240\u4ee5\u6c42\u534a\u5f84\uff08\u56e0\u4e3a\u5706\u7684\u9762\u79ef\u7b49\u4e8e \u03c0r\uff08\u5e73\u65b9\uff09\uff09\uff1a12\u300256 \uff1a \u03c0\uff083\u300214\uff09=4m \uff0c\u7136\u540e\u518d\u5f004\u7684\u5e73\u65b9\u6839\uff0c\u7b49\u4e8e2m
3\u3002\u7136\u540e\u6c42\u76f4\u5f84\uff1a2x2=4m
4\u3002\u63a5\u7740\uff1a\u5706\u7684\u5468\u957f\uff1a4 x \u03c0\uff083\u300214\uff09=12\u300256m
5\u3002\u6cf3\u6c60\u5185\u4fa7\u9762\u79ef\uff1a12\u300256 x 1.3 =16.328m\uff08\u5e73\u65b9\uff09
6\u3002\u603b\u9762\u79ef\uff08\u5e95+\u5185\u4fa7\uff09\uff1a12\u300256 + 16.328=28.888m\uff08\u5e73\u65b9\uff09
\u5e0c\u671b\u4e0d\u4f1a\u9519\u4e86\uff1a\uff09
\u7b2c\u4e8c\u4e2a\u3002
1\u3002\u5c06\u6c34\u6c60\u6ce8\u6ee1\u9700\u8981\uff1a12\u300256 \u00d7 1.3=16.328\uff08\u7acb\u65b9\uff09
2\u3002\uff08\u5982\u679c\u6211\u6ca1\u6709\u8bb0\u9519\u7684\u8bdd1t\u5c31\u662f1\u5428\uff09
\u9996\u5148\u7b2c\u4e8c\u4e2a\u95ee\u9898\u8981\u5148\u77e5\u9053\u6cf3\u6c60\u91cc\u6709\u591a\u5c11\u5428\u6c34\uff1a\u6309\u7167\u6bd4\u4f8b\u6765\u7b97\u7684\u8bdd\uff081m\u7acb\u65b9=1t\uff09\uff1a16.328m\uff08\u7acb\u65b9\uff09=16.328t
\u65e2\u7136\u77e5\u9053\u4e86\u6709\u591a\u5c11\u5428\u6c34\uff0c\u90a3\u4e48\u7b97\u4ef7\u94b1\u5c31\u5bb9\u6613\u4e86\uff1a16.328 \u00d7 2\u300237 = 38.69736\u5143
3\u3002\u4fdd\u7559\u4e00\u4f4d\u5c0f\u6570\u6240\u4ee5\u6700\u540e\u7684\u7b54\u6848\u662f\uff1a38.7\u5143
\u7b2c\u4e09\u9898\u3002
\u5df2\u77e5\uff1a\u76f4\u5f84\uff1a6cm\uff1b\u6c34\u9ad8\uff1a10cm\uff1b\u8336\u4e0e\u6c34\u7684\u6bd4\u4f8b1\uff1a50
\u9996\u5148\u6c42\u534a\u5f84\uff1a6\uff1a2=3cm
\u5e95\u90e8\u9762\u79ef\uff1a3\u00d7 3\u00d7\u03c0\uff083\u300214\uff09=28\u300226cm\uff08\u5e73\u65b9\uff09
\u6c34\u7684\u4f53\u79ef\uff1a28\u300226\u00d710=282\u30026cm\uff08\u7acb\u65b9\uff09
\u8f6c\u6210\u514b\uff1a\uff08\u6c34\u91cd\uff09282\u30026cm\uff08\u7acb\u65b9\uff09=282\u30026\u514b
\u6309\u7167\u8336\u4e0e\u6c34\u7684\u6bd4\u4f8b\uff081\uff1a50\uff09\uff1a
1\uff1a50=x\uff1a282\u30026 \uff08\u8fd9\u4e2a\u4f60\u4eec\u505a\u8fc7\u4e86\u5417\uff1f\uff09
x=1\u00d7282\u30026\uff1a50
x=5\u3002652
x\u5c31\u662f\u8336\u53f6\u7684\u91cd\u91cf\uff0c\u6240\u4ee5\uff0c\u9700\u8981\u8336\u53f65\u3002652\u514b
\u5982\u679c\u4e4b\u524d\u7684\u4f60\u4eec\u6ca1\u6709\u5b66\u8fc7\uff0c\u90a3\u4e48\u5c31\u5199282\u30026\uff1a50\u00d71=5\u3002652\u514b
\u5e0c\u671b\u5bf9\u4f60\u6709\u7528\uff0c\u4e5f\u4e0d\u51fa\u9519\uff1a\uff09
p(s<2)=p(s=-1)+p(s=0)+p(s=1)=1/12+2/12+2/12=5/12
s0=2/12=1/6
s<2=5/12
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