(x^2*y^3)^4+( -2x^4*y)^2*y^10=5x^8y^12求过程!急!
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
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2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知x/3=y/5=z/4,求x+y+z/y和x+y-z/y-x的值,2种方法.急等.
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y除以2x-y
已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值
已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
求这个二元一次方程组的过程 5x+2y=-9 3x-4y=-8 急
因式分解 求过程 x-xy+3y-3x 2x+xy-y-4x+5y-6