已知4x-3y-6z=0,x+2y-7z=0,(xyz≠0),求(2x+3y+6z)/(x+5y+7z)
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/05 13:58:42
![已知4x-3y-6z=0,x+2y-7z=0,(xyz≠0),求(2x+3y+6z)/(x+5y+7z)](/uploads/image/z/330217-25-7.jpg?t=%E5%B7%B2%E7%9F%A54x-3y-6z%3D0%2Cx%2B2y-7z%3D0%2C%EF%BC%88xyz%E2%89%A00%EF%BC%89%2C%E6%B1%82%EF%BC%882x%2B3y%2B6z%EF%BC%89%2F%EF%BC%88x%2B5y%2B7z%EF%BC%89)
已知4x-3y-6z=0,x+2y-7z=0,(xyz≠0),求(2x+3y+6z)/(x+5y+7z)
已知4x-3y-6z=0,x+2y-7z=0,(xyz≠0),求(2x+3y+6z)/(x+5y+7z)
已知4x-3y-6z=0,x+2y-7z=0,(xyz≠0),求(2x+3y+6z)/(x+5y+7z)
已知4x-3y-6z=0,
x+2y-7z=0
所以y=2z
x=3z
所以(2x+3y+6z)/(x+5y+7z)
=(6z+6z+6z)/(3z+10z+7z)
=18z/20z
=9/10