2元2次方程组x^2+sqrt(2)y=sqrt(3)y^2+sqrt(2)x=sqrt(3)x不等于y求y/x+x/y

证明不等式:x/(sqrt(y))+y/(sqrt(x))>=sqrt(x)+sqrt(y) lingo中min=sqrt(x^2+(y-a)^2)+sqrt((x-b)^2+(y-c)^2)+y;为啥不对 均值不等式 求教已知x>3,x+y^2+10y=3 求使sqrt(x-3)+y matlab中 >> x=-1:0.001:1; >> y=log((1+sqrt(1-x.^2))/x)+sqrt(1 求matlab画二元函数图象：(sqrt(1-y^2)-sqrt(1-x^2))*(x+y) (0 如何用matlab绘出函数Z=(1/(sqrt(((1-x)^2)+(y^2))))+(1/(sqrt(((1+x)^2 [关于椭圆几何性质]注：sqrt是根号 ^2是平方椭圆sqrt((x+1)^2+(y-1)^2)=|4x-3y-33|/ lim (sqrt(x+2)-sqrt(x))/(sqrt(x+1)-sqrt(x)) (X趋近于正无穷) z=sin(sqrt(x^2+y^2))/sqrt(x^2+y^2),-8≤x,y≤8； 用matlaB怎么编程! matlab程序：[X,Y] = meshgrid(-8:.5:8); R = sqrt(X.^2 + Y.^2) + arctan(y/x)=ln(sqrt(x^2+y^2)),请问dy/dx是什么? 用matlab解方程组：x^2+（y-25*sqrt(3))^2=100;(x-75)^2+y^2=6400;求高手指点