√1/2xy÷2√x×√2/xy
解方程组2xy-5√(xy+1)=10 x^2+y^2=34
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
不等式最值xy>0,x^2y=2,则xy+x^2的最小值?xy+x^2>=2√xy*x^2,xy=x^2时取最小,y=x
不等式最值xy>0,x^2y=2,则xy+x^2的最小值?xy+x^2>=2√xy*x^2,xy=x^2时取最小,y=x
数学极限计算lim(x,y)→(0,0) xy/ [√(2-e^xy)-1]= lim(x,y)→(0,0) -xy/(
(3x/2 √x/y - 2/5 √3/xy + 1/3 √xy/2 ) ÷ x/2 √ x/y
(xy-x^2)乘以(xy)/(x-y)
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
(x^2-xy)y÷y-x/xy怎么做?
(x+y-2xy)(x+y-2)+(1-xy)²
计算3xy[2xy-x(y-2)+x-1]