线性代数:求X,Y.(X 1)=(1 -5)+(4 X+Y)(0 1) (-1 1) (1 0 )
线性代数:求X,Y.(X 1)=(1 -5)+(4 X+Y)(0 1) (-1 1) (1 0 )
线性代数习题设二维随机变量(X,Y)的联合概率为f(x,y)=ce^-(3x+4y),x>0,y>0;0,其他.求(1)
x>1,y>0,且满足xy=x^y,x/y=x^3y,求x+y
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
若x^5+x^4y+x^4+x+y+1=0,且3x+2y=1,求x,y的值
已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
已知4x=9y求(1)x+y/y (2)y-x/2x
已知4x+y-4x-6y+10=0,求(三分之二x√9x+y√y分之x)-x√x分之1-5x√x分之y)的值
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
已知x²+y²+5=2x+4y,求代数式(2x²-(x+y)(x-y))x((x+y-1)
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7