1/x+1/y=(x+y)/xy=8
x+y=8xy
2x-3xy+2y/x+2xy+y
=[2(x+y)-3xy]/[(x+y)+2xy]
=(16xy-3xy)/(8xy+2xy)
=13xy/10xy
=13/10
已知1/x+1/y=8,求2x-3xy+2y/x+2xy+y的值
1个回答
相关问题
-
已知x-y=1/2,xy=8.求-1/2x³y-1/2xy³+x²y²的值.
-
.已知:x-y=1,xy=-2.求:(-2xy+2 x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
-
已知1/x-1/y=2,求x-8xy-y/3x+4xy-3y的值
-
已知1/y-1/x=3,求2x+3xy-2y/x-2xy-y的值
-
已知1/x+1/y=3,求x+xy+y/2x-3xy+2y的值.
-
已知x+y=8,xy=12,求(1)x2y+xy2(2)x2-xy+y2(3)x-y
-
已知x+y=[1/5]，xy=-[1/2]．求代数式（x+3y-3xy）-2（xy-2x-y）的值．
-
已知x-y=1,xy=2,求x^3y-2x^2y^2+xy^3的值
-
已知1/x+1/y=5,求x+2xy+y/2x-3xy+2y的值
-
已知x-y=-1,xy=3,求x³y-2x²y²+xy³的值