解方程组1/(x-y)-1/(x+y)=3/20,2/(x+y)+3/(x-y)=19/20我给点提示:1/(x-y)-1/(x+y)=3/20 ①2/(x+y)+3/(x-y)=19/20 ②......╮(╯▽╰)╭哎!看来还得问别人了
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/02 00:37:08
![解方程组1/(x-y)-1/(x+y)=3/20,2/(x+y)+3/(x-y)=19/20我给点提示:1/(x-y)-1/(x+y)=3/20 ①2/(x+y)+3/(x-y)=19/20 ②......╮(╯▽╰)╭哎!看来还得问别人了](/uploads/image/z/122359-31-9.jpg?t=%E8%A7%A3%E6%96%B9%E7%A8%8B%E7%BB%841%2F%EF%BC%88x-y%EF%BC%89-1%2F%EF%BC%88x%2By%EF%BC%89%3D3%2F20%2C2%2F%EF%BC%88x%2By%EF%BC%89%2B3%2F%EF%BC%88x-y%EF%BC%89%3D19%2F20%E6%88%91%E7%BB%99%E7%82%B9%E6%8F%90%E7%A4%BA%EF%BC%9A1%2F%EF%BC%88x-y%EF%BC%89-1%2F%EF%BC%88x%2By%EF%BC%89%3D3%2F20+%E2%91%A02%2F%EF%BC%88x%2By%EF%BC%89%2B3%2F%EF%BC%88x-y%EF%BC%89%3D19%2F20+%E2%91%A1......%E2%95%AE%28%E2%95%AF%E2%96%BD%E2%95%B0%29%E2%95%AD%E5%93%8E%EF%BC%81%E7%9C%8B%E6%9D%A5%E8%BF%98%E5%BE%97%E9%97%AE%E5%88%AB%E4%BA%BA%E4%BA%86)
解方程组1/(x-y)-1/(x+y)=3/20,2/(x+y)+3/(x-y)=19/20我给点提示:1/(x-y)-1/(x+y)=3/20 ①2/(x+y)+3/(x-y)=19/20 ②......╮(╯▽╰)╭哎!看来还得问别人了
解方程组1/(x-y)-1/(x+y)=3/20,2/(x+y)+3/(x-y)=19/20
我给点提示:
1/(x-y)-1/(x+y)=3/20 ①
2/(x+y)+3/(x-y)=19/20 ②
......
╮(╯▽╰)╭哎!看来还得问别人了
解方程组1/(x-y)-1/(x+y)=3/20,2/(x+y)+3/(x-y)=19/20我给点提示:1/(x-y)-1/(x+y)=3/20 ①2/(x+y)+3/(x-y)=19/20 ②......╮(╯▽╰)╭哎!看来还得问别人了
1/(x-y)-1/(x+y)=3/20,
2/(x+y)+3/(x-y)=19/20
设:1/(x-y)=a 1/(x+y)=b
a-b=3/20.1
2b+3a=19/20.2
1式*2+2式:
5a=6/20+19/20=25/20
a=5/20=1/4
b=a-3/20=5/20-3/20=2/20=1/10
1/(x-y)=1/4 x-y=4
1/(x+y)=1/10 x+y=10
相加:2x=14 x=7 相减:2y=6 y=3
x=15,y=-5
令x-y=a,
x+y=b
则b-a=3ab/20 1
2a+3b=19ab/20 2
解得:a=4 b=10
所以:x=7,y=3
设1/(x-y)=a 1/(x+y)=b
原方程则为:
b-a=3/20
2a+3b=19/20
解得:a= 1/10
b=1/4
∴1/x+y=1/10 x+y=10
1/x-y=1/4 x-y=4
∴x=7
y=3