大师作文网1\X-1\Y=3,求5X+XY-5Y\X-XY-Y的值.
来源：学生作业帮 编辑：大师作文网作业帮 分类：数学作业 时间：2024/11/10 12:02:02
1\X-1\Y=3,求5X+XY-5Y\X-XY-Y的值.
2-X\X-3=1\3-X -2
(2X^2-4XY)\(X-2Y)=
已知a^m=2,a^n=3,则a^m+n=___,a^2n=___
若X^2+MXY+81Y^2是一个完全平方式,则M=___
2-X\X-3=1\3-X -2
(2X^2-4XY)\(X-2Y)=
已知a^m=2,a^n=3,则a^m+n=___,a^2n=___
若X^2+MXY+81Y^2是一个完全平方式,则M=___
1\X-1\Y=3,求5X+XY-5Y\X-XY-Y的值.
1/x-1/y=3
(y-x)/xy=3
y-x=3xy
x-y=-3xy
(5x+xy-5y)/(x-xy-y)
=[5(x-y)+xy][(x-y)-xy]
=(-15xy+xy)/(-3xy-xy)
=-14xy/(-4xy)
=7/2
2-X\X-3=1\3-X -2
2-x=-1-2(x-3)
2-x=-1-2x+6
x=3
经检验,x=3是方程的增根,原方程无解.
(2X^2-4XY)\(X-2Y)=2X(X-2Y)/(X-2Y)=2X
已知a^m=2,a^n=3,则a^m+n=_a^m*a^n=2*3=6__,a^2n=_(a^n)^2=3^2=9__
若X^2+MXY+81Y^2是一个完全平方式,则M=__-18或+18_
x^2+mxy+81y^2=(x+9y)^2或=(x-9y)^2
展开得m=18,-18
1/x-1/y=3
(y-x)/xy=3
y-x=3xy
x-y=-3xy
(5x+xy-5y)/(x-xy-y)
=[5(x-y)+xy][(x-y)-xy]
=(-15xy+xy)/(-3xy-xy)
=-14xy/(-4xy)
=7/2
2-X\X-3=1\3-X -2
2-x=-1-2(x-3)
2-x=-1-2x+6
x=3
经检验,x=3是方程的增根,原方程无解.
(2X^2-4XY)\(X-2Y)=2X(X-2Y)/(X-2Y)=2X
已知a^m=2,a^n=3,则a^m+n=_a^m*a^n=2*3=6__,a^2n=_(a^n)^2=3^2=9__
若X^2+MXY+81Y^2是一个完全平方式,则M=__-18或+18_
x^2+mxy+81y^2=(x+9y)^2或=(x-9y)^2
展开得m=18,-18
已知x+y=-1,xy=-2,求代数式-5（x+y)+(x-y)+x(xy+y)的值
已知1/x-1/y=3,求x-2xy-y/5x+3xy-5y的值
已知1/x+1/y=5,求(3x-5xy+3y)/(x+xy+y)的值?
已知1/x-1/y=3,求代数式5x+xy-5y除以x-xy-y的值.
若1/x-1/y=3,求5x+2xy-5y/x-4xy-y的值
若1/x+1/y=5,求3x+4xy+3y/x+3xy+y的值
已知1/X-1/Y=-2,求3X-5XY-3Y/-X+3XY+Y的值
1/x+1/y=5,求2x-3xy+2y/x²+xy+y的值
已知1/x+1/y=5,求x+2xy+y/2x-3xy+2y的值
已知:1/X+1/Y=5,求 2x-3xy+2y/x+2xy+y的值,
已知x+y=3,xy=1,求代数式5xy+4x+7y+6x-3xy-4xy+3y的值.
已知x+y=-1,xy=-2,求代数式-5（x+y)+(x-y)+2(xy+y)的值