已知xcosγ=a,ycotγ=b(a不等于0,b不等于0),求证x^2/(a^2)-y^2/(b^2)=1
已知xcosθ=a,ycotθ=b(a≠0,b≠0),求证x^2/a^2-y^2/b^2=1
已知xcos阿尔法=a,tan阿尔法分之y=b(a,b不等于0),求证a方分之x方-b方分之y方=1
(1)已知a/x+b/y=1(b不等于y),求x; (2)已知K=y-9/x-m(k不等于0),求x.“/...
已知xcosθ=a,y/tanθ=b(a≠0,b≠0),求证x^2/a^2-y^2/b^2=1
1.已知a,b是正数,a不等于b.x,y,∈(0,+∞),求证a^2/X + b^2/Y ≥(a+b) ^2 / X+Y
已知3a*a+ab-2b*b=0(a不等于0,b不等于0),求a/b-b/a-(a*a+b*b)/ab的值.
设f(x)=lgx,a>0,b>0,且a不等于b,求证f(a)+f(b)/2
已知x^2/a^2+y^2/b^2=1(a>b>c,xy不等于0,则a^2/x^2+b^2/y^2最小值
已知f(x)=根号下1-x^2,当a不等于b时,求证|f(a)-f(b)|
已知:xy/(x+y)=a,xz/(x+z)=b,yz/(y+z)=c,且abc不等于0,求证:x=2abc/(bc+a
已知:xy/(x+y)=a,xz/(x+z)=b,yz/(y+z)=c,且abc不等于0,求证:x=2abc/(bc+a
已知a+b+c=0,abc不等于0,求证:(a^2+b^2+c^2)/(a^3+b^3+c^3)+2/3(1/a+1/b