x y x+yy x+y xx+y x y

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xyx+yyx+yxx+yxyxyx+yyx+yxx+yxyxyx+yyx+yxx+yxyc1+c2+c3第2,3列加到第1列2(x+y)yx+y2(x+y)x+yx2(x+y)xyr2-r1,r3-

x y x+yy x+y xx+y x y
x y x+y
y x+y x
x+y x y

x y x+yy x+y xx+y x y
c1+c2+c3 第2,3列加到第1列
2(x+y) y x+y
2(x+y) x+y x
2(x+y) x y
r2-r1,r3-r1
2(x+y) y x+y
0 x -y
0 x-y -x
=2(x+y)[-x^2+y(x-y)]
=-2(x+y)(x^2-xy+y^2)

x + y =x+y

x y x+yy x+y xx+y x y x y x+yy x+y xx+y x y (x-y)(x+y)(xx-yy)=? XX-YY/(X-Y)(X-Y)约分 xx-yy-x-y 因式分解 [2x-(x+y)(x-y)](yy-xx) 用行列式性质计算下列行列式x y x+yy x+y xx+y x y 已知2x=3y,求xy/xx+yy-yy/xx-yy的值 x-y=3,(x+y)(x+y)=25,求xy/xx+yy的值? 如何解这行列式,要具体过程X Y X+YY X+Y XX+Y X Y 已知(x+y)(x+y)=25,(x-y)(x-y)=9求xy与xx+yy的值因式分解：xx-2x-2yy+4y-xy xx-2xy+yy+4x-4y+4 分解因式：x-y-xx+2xy-yy+2 xx+4xy+yy-2x-4y+6 因式分解 x,+y=5 xy=3 求xx+yy xx+12*12=yy(y-x=2) 数学题XX*YY=ZXXZ中X,Y,Z各是几