计算:2√xy÷(-3/2√x²y)·3√x=
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
计算3xy[2xy-x(y-2)+x-1]
计算:3xy[2xy-x(y-2)+x]
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
计算3x/8y×16y²/27x² (2xy-x²)÷x-2y/xy 2x-6/x
计算9/4√48÷(3/8√16/5)=?;5x√xy ÷2√y ²/x×1/x√xy; 化简√-45x×√-
√x(√x+2√y)=√y(6√x+5√y,求x-3√xy+2y/x+√xy-6y
计算(3x^3y-x^2y+1/2xy)÷(-1/2xy)
计算:2x+2y分之3y + x²+xy分之2xy
计算:(-7x²y)(2x²y-3xy³+xy)
计算(1)3x/8y×16y²/27x² (2)(2xy-x²)÷x-2y/xy 2x-6