8x+3y+2=o,4x+5y+8=0
8x+3y+2=o,4x+5y+8=0
已知x,y,z满足方程组:4x-5y+2z=o;x+4y-3x=0,求x:y:z的值
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
解方程组x-2y=o,3x+2y=8和y=2x-1,4x-3y=1
微分方程(1)(y'')^2+5y'-y+x=0;(2)y''+5y'+4y^2-8x=0;(3)(3x+2y)dx+(
y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,
2x²-3xy=y²=0(x,y不得o)求x/y+y/x
已知x+2y-3x=0,2x+3y+5z=o.求x+y+z除以x-y+z
方程组x-2y=8,3x-4y=5,x=?,y=?
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
y满足x^2+y^2-4x-2y+5=0求根号下8y-2x分之根号下x+y(不包括+y)
9y=3x-(x-1),4(x+y)-(2x+4)=8y