(3x+2y)(9x²-6xy+4y²﹚
(3x+2y)(9x²-6xy+4y²﹚
用公式计算(2y-3x)(4y²+6xy+9x²﹚
(3x+2y)(9x²-6xy+4y²﹚
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
4x²+2x-9y²+3y,x²+6y-y²-9,x²-xy-2y
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
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
(2x²y-3xy²)-3(x²y-2xy²)+2(x²y-4xy
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
若A=2x²-4xy-2y²-2x+2y,B=4x²-6xy+2y²-3x-y.