tgA:tgB:tgC=x:y:z
Triquint禁运TGA TGB TGL TGF TGC系列的选型和采购
已知tgA=1/2,tgB=1/3,求cos(A+B)的值
一道几何求证已知三角形ABC中,AB=5,BC=6,AC=7.求:tgB和tgC的值
求导微分tgA=(y-y1)/(x-x1)求微分怎么求?
(x+y-z)(x-y+z)=
X+Y+Z=?
在△ABC中,tgA=1/4,tgB=3/5 (1)求角C的大小 (2)某△最大边的边长为根号17,求最小边的边长
f(x,y,z,w)=x*(x+y)*(x+y+z)*(x+y+z+w)
x y z x+y--- = --- = ---- ----y+Z z+x x+y ,求 z 的值 .求 x+y----
已知x+y-z/z=x-y+z/y=-x+y+z/x,且xyz不等于0,求分式[(x+y)(x+z)(y+z)]/xyz
若z分之x+y+z=y分之x-y+z=x分之-x+y+z,求xyz分之(x+y)(y+z)(z+x)
y+z÷x=Z+X÷y=X+Y÷z,X+Y+Z不等0求X+Y-Z÷X+Y+z值