1/12x+1/12X(1-40%)Y=1 1/15x+1/15X(1+20%)Y=1 解的X=3 ,

x.y都是自然数,且x(x-u)-y(y-x)+12,求x.y得值快1且x(x-y)-y(y-x)=12 [(y*y*y-y)/(xy+1)*(xy+1)-(x+y)*(x+y)]/[(x+y)*y/(x+1)]其中x=-11,y=1/12,化简再求值. （x+y)(x+y-1)-12因式分解 已知x^2+y^2-8x+12y+52=0 ,求1/2x-1/x-y(x-y/2x-x^2+y^2) 已知x^2+y^2-8x+12y+52=0 ,求1/2x-1/x-y(x-y/2x-x^2+y^2) 解方程组 2x-y=5 2y/x-x/y=12x-y=52y/x-x/y=1 先化简再求值; 解方程组 x(x-y)-y(x+y)+2xy 其中x=2 ,y=-22.x[x-x(x-1)],其中x=-2解方程组4x+3y=12x-y=32.y+1=2x 4x-y=2 3.2x+2y=0 2x-y+24=0 4x³y+12x²y²+9x y³/4x³-9x y²,其中x=1,y=1. 解方程组 （x+y）（x+y-1）=56 （x-y）（x-y-1）=12 (x+y)(x+y+1)=56,(x-y)(x-y+1)=12如何解这个方程组? 解方程组:(x+3)(y-2)=(x-3)(y+10),(x+1)(y+3)=(x-2)(y+12) 解方程组{2(x-y)/3 - x+y/4=-1 6(x+y)-41(x-y)=12 解方程：（x+3)(y-2)=(x-3)(y+10) (x-1)(y+3)=(x+2)(y+12) 解方程：x+12%x=[(1+40%)]y 急用! 4/X+1/Y=2,XY=-1,求代数式4Y-X/X-2Y/（x+2y-12Y²/x-2y)的值 X+2Y= -12X+Y+Z= 1-X+Y-Z= -1 x+y/10+x/15=1x+y/12+y/15=1 解方程组x-4y=-1x-4y=-12x+y=16