b^2x^2+a^2y^2=a^2b^2
(x+y)(a-2b)
已知:A=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B
define A(x,y) x*y-x/y main(){int a=5,b=2,y;y=A(a+b,a-b);prin
3x(a-b)-2y(b-a) 因式分解
x+y-(2x-y)(x+y)=?12(a^2-b^2)^2-3(a^2+b^2)(a+b)^2等于多少(2a-b)(2
1.已知集合A={(x,y)|y=2x+1},B={(x,y)|y=x+3},a∈A,b∈B,求a
设平面内有四个向量a,b,x,y,满足a=y-x,b=2x-y,a⊥b,|a|=|b|=1.
已知A=2x+y,B=2x-y,计算A²-B².
已知A=2x+y,B=2x-y计算A²-B²
(x-A)*(B-y)=x^2-9xy+8y^2,求A,B
(1) (a+2b/a-b)+(b/b-a)-(2a/a-b); (2) (y/x-y+z)+(2x+z/y-x-z)-
因式分解:x^2y^2-4x a(a-b)-2b(b-a)