用公式计算(2y-3x)(4y²+6xy+9x²﹚
用公式计算(2y-3x)(4y²+6xy+9x²﹚
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算:(xy-x²)×x-y/xy
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
数学用乘法公式计算(x+y+1)(x+y-1)(2x-y-3)²
分解因式计算6x³y(x-y)³-4xy³(y-x)²
计算3x/8y×16y²/27x² (2xy-x²)÷x-2y/xy 2x-6/x
(3x+2y)(9x²-6xy+4y²﹚
计算x²y³-2x(4xy³)
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