(1)已知1/x+1/x=3,求3x-4xy+3y/x+2xy+y的值 (2)已知x为整数,且2/x+3+2/3-x+2
来源:学生作业帮 编辑:拍题作业网作业帮 分类:数学作业 时间:2024/05/01 09:23:25
(1)已知1/x+1/x=3,求3x-4xy+3y/x+2xy+y的值 (2)已知x为整数,且2/x+3+2/3-x+2x+18/x^-9为整数,求所有符合条件的x的值的和
(1)
∵1/x+1/y=3
∴(y+x)/xy=3
∴x+y=3xy
(3X-4XY+3y)/(X+2XY+Y)
=[3(x+y)-4xy]/[(x+y)+2xy]
=(9xy-4xy)/(3xy+2xy)
=5/5
=1
(2)
2/x+3+2/3-x+2x+18/x^2-9
=[2(X-3)-2(X+3)+2X+18]/(X+3)(X-3)
=2(X+3)/(X+3)(X-3)
=2/(X-3)
∴X-3=±1,±2
∴X=4,2,5,1
符合条件x的值的和为4+2+5+1=12
∵1/x+1/y=3
∴(y+x)/xy=3
∴x+y=3xy
(3X-4XY+3y)/(X+2XY+Y)
=[3(x+y)-4xy]/[(x+y)+2xy]
=(9xy-4xy)/(3xy+2xy)
=5/5
=1
(2)
2/x+3+2/3-x+2x+18/x^2-9
=[2(X-3)-2(X+3)+2X+18]/(X+3)(X-3)
=2(X+3)/(X+3)(X-3)
=2/(X-3)
∴X-3=±1,±2
∴X=4,2,5,1
符合条件x的值的和为4+2+5+1=12
(1)已知1/x+1/x=3,求3x-4xy+3y/x+2xy+y的值 (2)已知x为整数,且2/x+3+2/3-x+2
已知:x-y=1,xy=-2.求:(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)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=3,求(3x+4xy-3y)/(x-2xy-y)的值
已知1/x+1/y=3,求3x-4xy+3y/(x+2xy+y)的值
已知:xy+x=-1,xy-y=-2,求多项式-x-[2y-2(xy+x)的平方+3x]+2[x+(xy-y)的平方]的
已知x-y=4,xy=-2,求代数式(2x+3y-2xy)-(x+4+xy)-(3xy+2y-2x)的值
1.已知x+y=-4,xy=3,求5(2分之1xy+2y)+[6x-(2xy+y-3x)]的值
已知(x+2)*+|y+1|=0求5xy*-{2x*y-【3xy*-(4xy*-2x*y)】}的值
(1)已知x-y=6,xy=4,求xy^-1+x^-1y的值; (2)已知x^2+y^2=3xy且xy≠0,求x^2y^
已知x-y=3,xy=1,求(-2x+2x+3y)-(3xy+2y-2x)-(x+4y+xy)
已知1/x减1/y=-3,则(2x+xy-2y)/x-xy-y的值为