Y(X+Y)+(X+Y)(X-Y)-X² ,其中X=-2 Y=½ 求先化简,再求值
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/17 20:55:53
![Y(X+Y)+(X+Y)(X-Y)-X² ,其中X=-2 Y=½ 求先化简,再求值](/uploads/image/z/5918735-47-5.jpg?t=Y%28X%2BY%29%2B%28X%2BY%29%28X-Y%29-X%26%23178%3B+%2C%E5%85%B6%E4%B8%ADX%3D-2+Y%3D%26%23189%3B+%E6%B1%82%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC)
xRn@+3_4>QAج"$*+$UŪ5q.H,͜{9g:q悔Z5 6COn?gKҴ͇|2_[OE?^t)|I0vU^LS5k EjfY;4S
_,Z
0$%u"59O|ƕ~6^]GIzAE?V
Y(X+Y)+(X+Y)(X-Y)-X² ,其中X=-2 Y=½ 求先化简,再求值
Y(X+Y)+(X+Y)(X-Y)-X² ,其中X=-2 Y=½ 求先化简,再求值
Y(X+Y)+(X+Y)(X-Y)-X² ,其中X=-2 Y=½ 求先化简,再求值
y(x+y)+(x+y)(x-y)-x²
=y(x+y)+x²-y²-x²
=xy+y²-y²
=xy
有x=-2,y=-1/2
解得xy=-2*(-1/2)=1
所以y(x+y)+(x+y)(x-y)-x²=1
原式=xy+y^2+x^2-y^2-x^2=xy
把
X=-2 Y=½
代入
得原式=-1
{(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)
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
|x|+|y|