(x^3+x^2+x)*(y^2+y+1)*(z+1)展开的不同项数为多少大神们帮帮忙
若3(X-Y)=2(X+Y),且X不等于0,则X/Y+Y/X的值为多少大神们帮帮忙
已知2x+y+3z=125,x+4y+5z=185,求x+2y+3z的值大神们帮帮忙
求导y=(x+1)(x+2)(x+3)(x+4)的导数大神们帮帮忙
1/2(x+y+z)的平方+1/2(x-y-z)(x-y+z)-z(x+y)化简为多少?
2(x+y)-3(x-y) =1 6(x+y)+7(x-y)=51大神们帮帮忙
若x+y+z不等于0,且x/(y+z)=y/(z+x)=z/(x+y),求x/(x+y+z)的值大神们帮帮忙
求y=1/x-3 +x (x>3)的最小值大神们帮帮忙
3分之1|x-y-z|+|x-3分之1|+(y-3)的平方=0大神们帮帮忙
若x,y,z均为实数,且(x-1)²+|y+2|+根号(z-3)²=0则x,y,z的值分别为?
已知x::y:z=3:4:5,(1)求x+y分之z的值;(2)若x+y+z=6,求x,y,z.
设X,Y,Z为正实数,求(1+2X)*(3Y+4X)*(4y+3z)*(2z+1)/(x*y*z)的最小值
已知x/2=y/3=z/4,求下列各式 (1)(x+y+z)/x (2)(x-y+2x/(x-y-2z)