|3x+y|-(y-6)²=0计算2x²y-(3xy-5x²y)+4xy
计算:(xy-x²)×x-y/xy
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
计算:x²y-(2xy²-5x²y)+3xy²-y³
用公式计算(2y-3x)(4y²+6xy+9x²﹚
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
计算:(-7x²y)(2x²y-3xy³+xy)
计算:2x+2y分之3y + x²+xy分之2xy
计算:x²+2xy+y²/xy-y².x²-2xy+y²/xy+y
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)