-4(x+y)^2+4a(x+y)-a^2

(2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y) 计算："3y/x+y"+"y/y-x"+"2x/x^2-y^2" "a+2/a^2-4a+4"-"1/2a+4"-"a- (1)计算：a-(a^2)/(a+1)-1 (2)计算：3x/(x-4y)+(x+y)/(4y-x)-7y/(x-4y) 分解因式1.2a(x-y)-3b(y-x)2.-x^y-2xy+35y3.a^(x-y)-4b^(x-y)若|a+2|+ A.A+(4X+3Y)B.A+(4X+6Y) C.A+2( 已知集合A={(x,y)|(y-2)/(x-1)=a+2,x,y∈R},B={(x,y)|(a²-4)x+(a 4a[x-y]的平方-2b【Y--X】的平方+[y-X]求过程 几道因式分解..4ab(a+b)^2-6a^2b(a+b)(x+y)^2(x-y)+(x+y)(x-y)^22a(a-3 因式分解：4a^2(x-y)+9(y-x) -4x^2y^2+x^3y+4xy^3 计算下面的题(过程)(a-b)(-a-b)(x-y)(y+x)^2(x-y+z)^2(x^2+y^2)(x^4+y^4) 因式分解(x-y)^2+4(x^2-y^2)+4(x+y)^2 a(x^2+2xy+y^2)-b(x^2-y^2) (x 计算（1）x/x+y-x/x-y （2）a+2+4/a+2 （3）x^2-y^2/xy÷(x+y)