x-xy=40,xy-y= -20,求代数式x-y和x+y-2xy算试
来源：学生作业帮助网 编辑：六六作业网 时间：2024/05/18 05:37:00
x-xy=40,xy-y=-20,求代数式x-y和x+y-2xy算试x-xy=40,xy-y=-20,求代数式x-y和x+y-2xy算试x-xy=40,xy-y=-20,求代数式x-y和x+y-2xy
x-xy=40,xy-y= -20,求代数式x-y和x+y-2xy算试
x-xy=40,xy-y= -20,求代数式x-y和x+y-2xy
算试
x-xy=40,xy-y= -20,求代数式x-y和x+y-2xy算试
(x-xy)+(xy-y)=40-20
x-xy+xy-y=20
x-y=20
(x-xy)-(xy-y)=40-(-20)
x-xy-xy+y=60
x+y-2xy=60
X-XY=4O
XY-Y=-20
1.
XY=X-40
X-40-Y=-20
X-Y=20
2.
前式+后式:X-Y=20,前式-后式:X+Y-2XY=60...
...
x-y=(x-xy)+(xy-y)=40+(-20)=20
x+y-2xy=(x-xy)-(xy-y)=40-(-20)=60
已知:x-xy=40,xy-y=-20,求代数式x-y和x+y-2xy的值.
x-xy=40,xy-y= -20,求代数式x-y和x+y-2xy算试
已知1/x+1/y=3,求分式(3x-3xy+3y)/(x+xy+y)的值我知道第一步是两边都乘以xy得x+y=3xy,然后怎么代进去,求回答!
x^2+xy+x=36,y^2+xy+y=20,求x+y.
|x|/x+y/|y|+xy/|xy|=
sin(xy)=x 求dx/dysec(xy)-y ]/x 还是 x/[sec(xy)-y]
已知x—xy=40,xy—y=—20,求代数式x—y和x+y—2xy的值
已知x-xy=40,xy-y=-20,求x-y和x+y-2xy的值.要有 过程,把你怎么想的写出来.
初三数学 代值计算当x/y=3/4时,求分式(xy+y^2)/(x^2-xy)的值
X+Y=50 XY=616 求XY
3X^2+XY+Y=15 求XY.
如果xy+x+y=6,试求自然数 xy
已知x-xy=8,xy-y=-9,求x+y-2xy的值
1-2/x+y=xy,4y+6x=xy.求xy的解?
当x-y=2xy时,求4x-3xy-4y/xy
y/x=ln(xy) 求dy/dx(xy-y^2)/(xy+x^2)
已知xy^2=-2,求-xy（x^2y^5-xy^3-y)的值.
已知xy^2=-2 求-xy(x^2y^5-xy^3-y)