帮帮我数(英)题The total surface area of a right circular con is 90pai cm2. Its 半径 is 5cm. What is tje volume of the cone写错了是求体积是多少

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帮帮我数(英)题The total surface area of a right circular con is 90pai cm2. Its 半径 is  5cm. What is tje volume of the cone写错了是求体积是多少

帮帮我数(英)题The total surface area of a right circular con is 90pai cm2. Its 半径 is 5cm. What is tje volume of the cone写错了是求体积是多少
帮帮我数(英)题
The total surface area of a right circular con is 90pai cm2. Its 半径 is 5cm. What is tje volume of the cone
写错了是求体积是多少

帮帮我数(英)题The total surface area of a right circular con is 90pai cm2. Its 半径 is 5cm. What is tje volume of the cone写错了是求体积是多少
9cm正方形 两边去掉1cm 考虑圆心 圆心距离四边都超过1cm则要交钱再玩 圆心距离两条边都少于1cm则压在顶上 (圆心在四个角落 面积4*1*1=4)总面积9*9=81
所以1;p=4*1*7/81=28/81 2:4/81
别忘给分哦

不会吧这都有得找 唉,这纯属——作弊,更何况这难找啊! (⊙o⊙)… 今天起开始努力学习,明年你会爱上考试,因为那正是验证你才华的时刻!

写清楚一点

假设两地相距S m,甲的速度是V1,乙的速度是V2,则可得下面两个方程:
1、(V1+V2)×M=S
2、(V1-V2)×N=S
两式相比,得:
(V1+V2)×M/((V1-V2)×N)=1
计算结果得:
V1/V2=(N+M)/(N-M)
选D

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