（3a+2y)^2-(3x-2y)^2=( )

(2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y) 已知方程组 2x+y=3a x-2y=a 求x/y （3a^3/X+Y)^3*(X^2-Y^2)除以（Y-X/Y+X)^2 (x-2y)^5=a0(x+2y)^5+a1(x+2y)^4*y+a2(x+2y)^3*y^2+a3(x+2y)^2*y^3+a4(x+2y)y^4+a (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 因式分解：a(x-y)^2+b(y-x)^3 4(x-y)^2+8(y-x)(x+y)1.a(x-y)^2+b(y-x)^3 2.4(x-y)^2+8(y-x)(x+y) (x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) A={(x,y)|y=-x^2+mx-1},B={(x,y)|y=3-x,0A={(x,y)|y=-x^2+mx-1},B={(x,y)|y=3-x,0 (x+y)(2x-3y)=? 解关于x、y的方程组2x-y=a,2x+y=-3 x+y=a,x-y=b.求2x-3y等于 已知3x+2y=a,2x+3y=b,则(x+y)(x-y)=? 集合A={（x,y)|y=-x^2+mx-1},B={(x,y)|y=3-x,0 方程组:3（x+y)-a(x-y)=16,2(x+y)+b(x-y)=15的解是什么? 如果方程组x-y=a-3,2x+y=5的解x、y满足x>0,y 36a^3(x-y)^2/27a(y-x) 5a(x-y)^2+10a(y-x)^3