这几道分式求值题怎么做?1) 1/x-1/y=3则 (2x-3xy-2y)/(x-2xy-y)=?2) 已知a+b+c=0,a+b+c不等于0,则a(1/b+1/c)+b(1/c+1/a)+c(1/a+1/b)+3=?3) x^2-5x+1=0,求x^2+1/x^24) xy/x+y=6 .xz/x+z=8 .yz/y+z=4求 x,y,z
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/24 17:49:37
![这几道分式求值题怎么做?1) 1/x-1/y=3则 (2x-3xy-2y)/(x-2xy-y)=?2) 已知a+b+c=0,a+b+c不等于0,则a(1/b+1/c)+b(1/c+1/a)+c(1/a+1/b)+3=?3) x^2-5x+1=0,求x^2+1/x^24) xy/x+y=6 .xz/x+z=8 .yz/y+z=4求 x,y,z](/uploads/image/z/14657729-41-9.jpg?t=%E8%BF%99%E5%87%A0%E9%81%93%E5%88%86%E5%BC%8F%E6%B1%82%E5%80%BC%E9%A2%98%E6%80%8E%E4%B9%88%E5%81%9A%3F1%29+1%2Fx-1%2Fy%3D3%E5%88%99+%EF%BC%882x-3xy-2y%29%2F%EF%BC%88x-2xy-y%29%3D%3F2%29+%E5%B7%B2%E7%9F%A5a%2Bb%2Bc%3D0%2Ca%2Bb%2Bc%E4%B8%8D%E7%AD%89%E4%BA%8E0%2C%E5%88%99a%281%2Fb%2B1%2Fc%29%2Bb%281%2Fc%2B1%2Fa%29%2Bc%281%2Fa%2B1%2Fb%29%2B3%3D%3F3%29+x%5E2-5x%2B1%3D0%2C%E6%B1%82x%5E2%2B1%2Fx%5E24%29+xy%2Fx%2By%3D6+.xz%2Fx%2Bz%3D8+.yz%2Fy%2Bz%3D4%E6%B1%82+x%2Cy%2Cz)
这几道分式求值题怎么做?1) 1/x-1/y=3则 (2x-3xy-2y)/(x-2xy-y)=?2) 已知a+b+c=0,a+b+c不等于0,则a(1/b+1/c)+b(1/c+1/a)+c(1/a+1/b)+3=?3) x^2-5x+1=0,求x^2+1/x^24) xy/x+y=6 .xz/x+z=8 .yz/y+z=4求 x,y,z
这几道分式求值题怎么做?
1) 1/x-1/y=3则 (2x-3xy-2y)/(x-2xy-y)=?
2) 已知a+b+c=0,a+b+c不等于0,则
a(1/b+1/c)+b(1/c+1/a)+c(1/a+1/b)+3=?
3) x^2-5x+1=0,求x^2+1/x^2
4) xy/x+y=6 .xz/x+z=8 .yz/y+z=4求 x,y,z
这几道分式求值题怎么做?1) 1/x-1/y=3则 (2x-3xy-2y)/(x-2xy-y)=?2) 已知a+b+c=0,a+b+c不等于0,则a(1/b+1/c)+b(1/c+1/a)+c(1/a+1/b)+3=?3) x^2-5x+1=0,求x^2+1/x^24) xy/x+y=6 .xz/x+z=8 .yz/y+z=4求 x,y,z
1)1/x-1/y=3 所以y-x=3xy带入后面的问题得9/5
2)通分得(a2b+a2c+b2a+b2c+c2a+c2b+3abc)/abc,整理得[ab(a+b+c)+bc(a+b+c)+ac(a+b+c)]/abc 所以得0
3)x2=5x-1后面通分后带入,然后再带入得23
4)将等式翻过来得1/x+1/y=1/6 1/x+1/z=1/8
1/y+1/z=1/4可解得1/x 1/y 1/z 得x=48 y=48/7 z=48/5