ⅠX Y X+Y Ⅰ ⅠY X+Y X Ⅰ Ⅰ X+Y X YⅠ行列式计算要用性质计算
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ⅠX Y X+Y Ⅰ ⅠY X+Y X Ⅰ Ⅰ X+Y X YⅠ行列式计算要用性质计算
ⅠX Y X+Y Ⅰ ⅠY X+Y X Ⅰ Ⅰ X+Y X YⅠ行列式计算
要用性质计算
ⅠX Y X+Y Ⅰ ⅠY X+Y X Ⅰ Ⅰ X+Y X YⅠ行列式计算要用性质计算
c1+c2+c3
2(x+y) y x+y
2(x+y) x+y x
2(x+y) x y
r3-r2,r2-r1
2(x+y) y x+y
0 x -y
0 -y y-x
--此时用对角线法则得
= 2(x+y)[x(y-x)-y^2]
= -2(x^3+y^3).
|X Y X+Y |
|Y X+Y X |
| X+Y X Y|,第二、三行加到第一行,提公因式2(X+Y)得2(X+Y)*
|1 1 1|
|Y X+Y X|
|X+Y X Y|,按第一行展开,得2(X+Y)*
Y(X+Y)-X^2-[y^2-X(X+Y)]+XY-(X+Y)^2
=2(X+Y)(XY-X^2-Y^2)
=-2(X^3+Y^3).
{(x,y) |x|+|y|
x>y?x:y
x^/y-x-y^/y-x化简.
化简x(y-x)-y(x-y)
行列式计算 x y x+y y x+y x x+y x y|x y x+y ||y x+y x ||x+y x y |
y/(x+y)-x/(x-y)
ⅠX Y X+Y Ⅰ ⅠY X+Y X Ⅰ Ⅰ X+Y X YⅠ行列式计算要用性质计算
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
x y x+yy x+y xx+y x y
(3x-y)(3y+x)-(x-y)(x+y)
化简x/y(x+y)-y/x(x+y)
化简 x / y(x+y) - y / x(x+y) =
化简:(x+ y)(x-y) +(x+ y) +(x-y)
x+y
(x+y)
|x+y|
x y x+yy x+y xx+y x y
化简y(x+y)+(x+y)(x-y)-x^2