Question

英文数学题！！！！

#1

the sum of two numbers is 28.find the numbers if the sum of their squares is a minimum.

#2

two numbers have a difference of 16.. find the numbers if the result of adding their sum and their product is a minimum

#3

a uniform border on a framed photograph has the same area as athe photograph. what are the outside dimensions of the border if the dimensions of the photograph are 25 cm by 20 cm .

#4

a bus company carries about 20000 riders per day for a fare of 90 $ a survey indicates that if the fare is decreased. the number of riders will increase by 2000 for every 5$ of decrease. what ticket price would result in the greatest revenue ?

#6

a lifeguard marks off a rectangular swimming area at a beach with 200 m of rope. what is the greatest area of water she can enclose ?
请写出全过程

Answer 1

1。the sum of two numbers is 28.find the numbers if the sum of their squares is a minimum.
两数之和为28。如果两数之积为最小值，两数分别是多少？

2。two numbers have a difference of 16.. find the numbers if the result of adding their sum and their product is a minimum
两数之差为16。如果两数的和与积之和为最小值，求两数分别是几。

3。a uniform border on a framed photograph has the same area as athe photograph. what are the outside dimensions of the border if the dimensions of the photograph are 25 cm by 20 cm .
一个均匀宽度的相框的面积与里面相片的面积相同。若相片长20厘米，宽25厘米，求相框外围的的长宽。

4。a bus company carries about 20000 riders per day for a fare of 90 $ a survey indicates that if the fare is decreased. the number of riders will increase by 2000 for every 5$ of decrease. what ticket price would result in the greatest revenue ?
一个公交车公司每天载客量为20000，每人每张票价为90元。某调查问卷显示，如果票价降低，每降低5元，载客量将增加2000人。为了最高的利润，公司应该把票价定在多少元？

（没有第五题）

6。a lifeguard marks off a rectangular swimming area at a beach with 200 m of rope. what is the greatest area of water she can enclose ?
一个救生员用一根200米长的绳子围出一个长方形的游泳面积。她能围出的最大的面积是多少？