计算:1)√(xy/2)-1/x√8x³y+1/y√18xy³(x>0,y>0) 2)解不等式x+3
计算3xy[2xy-x(y-2)+x-1]
数学极限计算lim(x,y)→(0,0) xy/ [√(2-e^xy)-1]= lim(x,y)→(0,0) -xy/(
计算(3x^3y-x^2y+1/2xy)÷(-1/2xy)
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
计算(1)3x/8y×16y²/27x² (2)(2xy-x²)÷x-2y/xy 2x-6
计算:3xy[2xy-x(y-2)+x]
xy(xy+1)+(xy+3)-2(x+y+2分之一)-(x+y-1)的平方
计算:(-7x²y)(2x²y-3xy³+xy)
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
计算:(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3
(√xy -xy分之x+√xy)除以√xy -y分之x-y(x>0,y.0)
(1) -3X^-2XY-8XY-(-5Y^2)-2X^2-Y^2