求解4X²-4X+1 和-3X²+6XY-3Y²
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
(2x²y-3xy²)-3(x²y-2xy²)+2(x²y-4xy
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
(1).设A=2X²-3Xy+y²+X-3y,B=4X²-6xy+2y²+4X-
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
已知x,y满足x²+y²-4x-6y+13=0,求(- y/x^3)^3÷(- 1/xy)^4.(x
设A=2x²-3XY+Y²,B=4X²-6XY-3Y²,且(X-5)和(Y+2)
初二数学通分问题2x+6y/x—3y和x/x—9y²和1/x²6xy+9y²
x四次方+x³-3x²-4x-4 x(x-1)+y(y+1)-2xy (x-2)³-(y-
化简4xy-3y²-3x²+xy-3xy-2x²+x²-2y²
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)