(1)计算:(-3xy)²·2x³÷(-6x² y); (2)化简:[(2x+y)
计算3x/8y×16y²/27x² (2xy-x²)÷x-2y/xy 2x-6/x
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
计算(1)3x/8y×16y²/27x² (2)(2xy-x²)÷x-2y/xy 2x-6
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
计算:(-7x²y)(2x²y-3xy³+xy)
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
计算3xy[2xy-x(y-2)+x-1]
计算x²y³-2x(4xy³)
计算[xy(x²-3y)+3xy²]·(-2xy)+x³y²(2x-y)
化简x-y分之x + x³-2x²y+xy²分之y³ ÷ y²-x
计算:(x+y/x-y)÷(xy+x^2)
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)