1:有二个同心圆所组成的圆环的面积为较小圆面积的七分之九,求较大圆与较小圆的半径比用所给词的适当形式填空 1:These_____(not be)their English books.2:The man is my ____(mother)uncle.3:Are those your_
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/11 11:35:37
![1:有二个同心圆所组成的圆环的面积为较小圆面积的七分之九,求较大圆与较小圆的半径比用所给词的适当形式填空 1:These_____(not be)their English books.2:The man is my ____(mother)uncle.3:Are those your_](/uploads/image/z/2396300-68-0.jpg?t=1%EF%BC%9A%E6%9C%89%E4%BA%8C%E4%B8%AA%E5%90%8C%E5%BF%83%E5%9C%86%E6%89%80%E7%BB%84%E6%88%90%E7%9A%84%E5%9C%86%E7%8E%AF%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B8%BA%E8%BE%83%E5%B0%8F%E5%9C%86%E9%9D%A2%E7%A7%AF%E7%9A%84%E4%B8%83%E5%88%86%E4%B9%8B%E4%B9%9D%2C%E6%B1%82%E8%BE%83%E5%A4%A7%E5%9C%86%E4%B8%8E%E8%BE%83%E5%B0%8F%E5%9C%86%E7%9A%84%E5%8D%8A%E5%BE%84%E6%AF%94%E7%94%A8%E6%89%80%E7%BB%99%E8%AF%8D%E7%9A%84%E9%80%82%E5%BD%93%E5%BD%A2%E5%BC%8F%E5%A1%AB%E7%A9%BA+1%EF%BC%9AThese_____%28not+be%29their+English+books.2%3AThe+man+is+my+____%28mother%29uncle%EF%BC%8E3%3AAre+those+your%EF%BC%BF)
1:有二个同心圆所组成的圆环的面积为较小圆面积的七分之九,求较大圆与较小圆的半径比用所给词的适当形式填空 1:These_____(not be)their English books.2:The man is my ____(mother)uncle.3:Are those your_
1:有二个同心圆所组成的圆环的面积为较小圆面积的七分之九,求较大圆与较小圆的半径比
用所给词的适当形式填空 1:These_____(not be)their English books.
2:The man is my ____(mother)uncle.
3:Are those your__(dictionary)?
4:Can you __(bring)your new picture here?
1:有二个同心圆所组成的圆环的面积为较小圆面积的七分之九,求较大圆与较小圆的半径比用所给词的适当形式填空 1:These_____(not be)their English books.2:The man is my ____(mother)uncle.3:Are those your_
圆面积的公式是π R²
圆环和小圆的面积比是7:9 就是说大圆和小圆的比是16:9
π相同的情况下 半径的比就是 4:3
1,These are not (not be)their English books.
2,The man is my mother’s(mother)uncle.mother’s(一撇s 表示妈妈的)
3:Are those your dicitionaries(dictionary)? 字典可数名词 those用复数
4:Can you bring(bring)your new picture here?
1、设大圆半径R,小圆半径r,圆环面积为pi*(R^2-r^2)
面积比:pi*(R^2-r^2)/[pi*r^2]=7/9 得到:R/r=4/3
2、are not
mother's
dictionries
bring
1. 3:根号7
1. are not
2. mother's
3. dictionaries
4. bring
派乘(R的平方-r的平方)= 派乘r的平方乘七分之九
R的平方=七分之十六r的平方
R:r=根号下7:4
aren't
mother'
dictionaries
bing