x+y=16 8x+4y=104

x+y=16 8x+4y=104 若x-y=1 化简（x+y)(x^2+y^2)(x^4+y^4)(x^8+y^8)(x^16+y^16) 8x-8y-3x-3y=-12,6x+6y-8x+4y=16 3分之2(x-y)-4分之x+y=-1 8(x+y)-4(2x-y)=16 8（x-y)=3（x+y)-12 6（x+y)=4（2x-y)+16 8（x-y)=3（x+y)-12 6（x+y)=4（2x-y)+16 [(x+2y)(x-2y)-(x-2y)^2+8y(x+y)]除以4x= x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 已知x^2-8x+y^2-y+16又1/4=0,求[(x+y)(x-y)-(x+y)^2-2y(x-3y)]÷4y的值 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian 化简 x / y(x+y) - y / x(x+y) = 7x:4y,x:y=( ):( (x-4y)(2x+y)= 5x-4y(y-x)=? 9y=3x-(x-1),4(x+y)-(2x+4)=8y [(2x-y)^2-y(y-4x)-8x]其中x=-1/2 [(2x+y)²-y(y+4x)-8x】/4x,其中x=-1,y=2005 急