5x+4y=44 且(5x+y)=(4y+x) 求x y各是多少?

5x+4y=44 且(5x+y)=(4y+x) 求x y各是多少? 2x-y=5且x:y=4: 5x-4y(y-x)=? 设|x|-|y|+|z|=|x+y+z|,且|x+y|=4,|y+z|=5,|y|=3,求(x-y-z)^2的值 已知7x+5y/2y-x=3/2,且x≠0,求X/x-4y 如果|X|=4 |Y|=2 且|X+Y|=X+Y 求X+Y 已知x*x-2xy-3y*y=0且x不等于0 y不等于0,那么5x-4y/5x+4y= 已知5x-4y=0且xy不等于0,求x^2+y^2/x^2-y^2-x+y/x-y的值 x+y／y=5／4,则x／y=---------------- 已知：4x = 5y,求(x+y) ：y 已知x y都是实数 且y=√x-4+√4-x+5,求y^x的平方根 （5x+3y)(3y-5x)-(4x-y)(4y+x)= x*x+2x+y*y-4y+5=0 x= y= 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 若x^5+x^4y+x^4+x+y+1=0,且3x+2y=1,求x,y的值 先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5