英文数学题 要求列方程解答An investor received $1400 interest per annum from a sum of money, with part of it invested at 10% and the remainder at 7% simple interest.This investor found that if she interchanged the amounts she had invested
来源:学生作业帮助网 编辑:作业帮 时间:2024/05/30 23:49:13
英文数学题 要求列方程解答
An investor received $1400 interest per annum from a sum of money, with part of it invested at 10% and the remainder at 7% simple interest.This investor found that if she interchanged the amounts she had invested she could increase by $90 per annum.Calculate the total amount invested
Let the amounts invested in 10% and 7% x and y dollars respectively:
x*10% + y*7% = 1400
x*7% + y*10% = 1400 + 90
y = 10000
x = 7000
Total is $17000
设为x,invest y
得到0.1y†0.07(x-y)=1400.
0.1(x-y) 0.07y-1400=90
0.07x-0.03y=1400
0.1x-0.03y=2300
0.03x=900
x=30000
翻译一下再解答
要求列方程解答
英文数学题 要求列方程解答An investor received $1400 interest per annum from a sum of money, with part of it invested at 10% and the remainder at 7% simple interest.This investor found that if she interchanged the amounts she had invested
小学数学题要求列式计算,请问列方程可不可以?
这两道数学题怎么列方程?求详细解答谢谢了
这题咋做?列方程解答,
列方程求解答
请列方程解答
是列方程解答
列方程并解答
求列方程解答
列方程来解答
用列方程解答
列方程 并解答
请列方程解答
求列方程解答
要列方程解答
列方程并解答
列方程解答,