若(X×X+Y×Y)(X×X+Y×Y-5)=36,则X×X+Y×Y＝
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若(X×X+Y×Y)(X×X+Y×Y-5)=36,则X×X+Y×Y＝若(X×X+Y×Y)(X×X+Y×Y-5)=36,则X×X+Y×Y＝若(X×X+Y×Y)(X×X+Y×Y-5)=36,则X×X+Y×
若(X×X+Y×Y)(X×X+Y×Y-5)=36,则X×X+Y×Y＝
若(X×X+Y×Y)(X×X+Y×Y-5)=36,则X×X+Y×Y＝
若(X×X+Y×Y)(X×X+Y×Y-5)=36,则X×X+Y×Y＝
你把X*X+Y*Y看成一个未知数,比如是t,t>=0
原题就是t(t-5)=36
所以是9,舍去了-4这个值
m=x*x+y*y
m*(m-5)=36
m^2-5m-36=0
(m-9)*(m+4)=0
m1=9
m2=-4
{(x,y) |x|+|y|
x>y?x:y
若(X×X+Y×Y)(X×X+Y×Y-5)=36,则X×X+Y×Y＝
若X-Y>X,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-5)*（x+y-5)+（x-y+3)=0 x*x-y*y
已知:3x-5y=0,求x/y,x-y/y,x-y/x
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)