方乘组X/2-《Y+1》/3=1和3X+2Y=10

已知X,Y,满足(X+3Y)(X-3Y)=-10(Y^2-6/5)和2X(Y-1)+4(1/2X-1)=0 先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y 解方程组3(x+y)-4(x-y)=4和(x+y)/2+(x-y)/6=1 已知X和Y满足3X+4Y=2,X-Y-1/7 (3x-y)^2+(3x+y)(3x-y),x=1,y=-2 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 2(x+y) 3x+3y=24 x+y/2x x y/2y= 1 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 解方程组:(x+3)(y-2)=(x-3)(y+10),(x+1)(y+3)=(x-2)(y+12) { x-y/7-x+y/10=1/2 {2(x-y)+5(x+y)=3 已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-( 10/x+y+3/x-y=-5 15/x+y-2/x-y=-1（用换元法解此方程组）