A=4x^2-2xy+4y^2,B=3x^2-6xy+3y^2,|x|=3,y^2=16,|x+y|=1.求4A+[(2
A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y,若x=
1.设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,
1.设A=2x²-3xy+y²+x-3y,B=4x²-6xy+2y²+4x-y,
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若x
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y.若x
x^+2xy+y^+4=16 x^-2xy+y^=16 求(3xy+6y^)+|x^-(2xy+2y^-3x^)|的值
设A=2x-3xy+y+x-3y,B=4x-6xy+2y+4x-y,若|x-3a|+(y+3)=0,且B-2A=a.求A
x²(x+y)(y-x)-xy(x+y)(x-y) 已知a+b=4,ab=-2,求多项式3a²b+3
已知:A=X*X-3xy+y*y,B=2x*x+xy-3y*3y.求A+B,A-B,A+2B
若A=2x²-4xy-2y²-2x+2y,B=4x²-6xy+2y²-3x-y.
设A=2X²-3xy+y²-x+2y,B=4x²-6xy+2y²-3x-y,若|
设A=2x²-3xy+y²-x+2y,B=4x²-6xy+2y²+3x-y 若|