x^2-xy=2,y^2-xy=8,x^2-y^2

来源：学生作业帮助网 编辑：作业帮 时间：2024/11/25 23:20:34
x^2-xy=2,y^2-xy=8,x^2-y^2
xPJ@,ڡE"t3i(45Bi)nb+Ad&q_LF[A)$p=sn{da5ywm{iM[]EG4bAM4}ρAmuw4[*:F$= "k-u1 F NGۭt6L+pyEN,)7H>%Q-$ϭ$fBt{4@f"iNQ$7̿$#&9c< >,!9^гe̺(k0S|zb;;`D_W:

x^2-xy=2,y^2-xy=8,x^2-y^2
x^2-xy=2,y^2-xy=8,x^2-y^2

x^2-xy=2,y^2-xy=8,x^2-y^2
x^2-xy=2 ①
y^2-xy=8 ②
①-②得到
x^2-y^2=-6

x^2-xy=2
x(x-y)=2 ①
y^2-xy=8
y(y-x)=8
y(x-y)=-8②
①+②的(x-y)(x+y)=-6
即x^2-y^2=-6

x^2-xy=2 得：x^2=2+xy
y^2-xy=8得：y^2=8+xy
x^2-y^2=（2+xy）-（8+xy）=-6

因x^2-xy=2 y^2-xy=8
列式为x^2-xy-（y^2-xy）
=x^2-xy-y^2+xy
-xy与xy可抵消
则x^2-y^2=2-8
=-6
祝您学习进步，更上一层楼！如果答案您满意，请记得采纳，谢谢！(⊙o⊙)

[-xy^2(2x+y)-8xy)-x^2y)]除以2xy=计算 已知x-xy=8,xy-y=-9,求x+y-2xy的值 （-3x^y+2xy)-( )=4x^+xy (XY-X^2)除以X-Y/XY=? 诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy) 已知xy/x+y=2,求代数式8x-5xy+8y/-x+3xy-y的值 由已知x+y=-2,xy=3那么2(x+xy)-[(xy-3y)-x]-(-xy)等于多少? 已知x+y=1,xy=-2,则x²y+xy²-2xy y/x=ln(xy) 求dy/dx(xy-y^2)/(xy+x^2) 1-2/x+y=xy,4y+6x=xy.求xy的解? 当x-y=2xy时,求4x-3xy-4y/xy X²+2xy+y²/xy乘x²-2xy+y²/xy+y²= x*x+xy=3,xy+y*y=2,则x*x+2xy+y*y=________? ( )*3xy=6x^2y+2xy^2 2xy+5y^2+( )=x^2+3xy ( )-(x^2+3xy)=-xy-1/3y^2 3X^2+XY+Y=15 求XY. 若1/x-1/y=2,求3x-2xy-3y/x-xy-y的值3x-2xy-3y/x-xy-y 不好意思，是3x-2xy-3y/x-2xy-y