2z=y,x:y=():() 3a=2b,a:b=():()
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(a-b)+(-2a-b)=?(x+y-z)+(x-y+z)-(x-y-z)=?
(y-x)/(x+z-2y)(x+y-2z)+(z-y)(x-y)/(x+y-2z)(y+z-2x)+(x-z)(y-z)/(y+z-2x)(x+z-2y)的值我已经做到这了:设(X-Y)为a (Z-Y)为b (Z-X)为c则原题= (-a*-c)/-(a+b)(b+c)+ab/-(c+b)(a+c)+c*-b/(-a+c)(a+b)
已知x/2=y/7=z/3,A=y/(x+y+z),B=(x+z)/y,C=(x+y-z)/x,比较A,B,C的大小
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z
2z=y,x:y=():() 3a=2b,a:b=():()
x+y+z=12 x-y+z=2 x-z+y+a=90 x+y+a+z=100,求x y z a
三元一次方程组:y+z-3x=2a;z+x-3y=2b;x+y-3z=2c求解
已知x+y+z=3a,(a≠0,x,y,z不全等).求(x-a)(y-a)+(y-a)(z-a)+(z-a)(x-a)/(x-a)^2+(y-a)^2+(z-a)^2
x+y+z=3a(a不等于0,x,y,z不全相等)求[(x-a)(y-a)+(y-a)(z-a)+(z-a)(x-a)]/[(x-a)^2+(y-a)^2+(z-a)^2]
已知X+Y+Z=3a求(X-a)(Y-a)+(Y-a)(Z-a)+(Z-a)(X-a)/(X-a)2;+(Y-a)2;+(Z-a)2;,a≠0,X,Y,Z不全相等,
填空a(x+y-z)+b(x+y-z)-c(x+y-z)=(x+y-z)乘以()
(z-x)2-4(x-y)(y-z)=0 求证x-2y+z=0 (提示:设x-y=a,y-z=b,则x-z=a+b)写错了是(z-x)的平凡-4(x-y)(y-z)=0 求证x-2y+z=0 (提示:设x-y=a,y-z=b,则x-z=a+b)那个平凡老是打不出来!sorry
证明 :x/(y+z)+y/(z+x)+z/(x+y)>=3/2其中 x,y,z>0
已知向量a=(x+z,3),b=(2,y-z),a垂直b,若x,y满足不等式|x|+|y|
(x+y)^2-z^=a^2-(b-c)^2=(x-y)^3-x+y=16(x+y)^2-25(x-y)^2=
解方程组:X+Y-3Z=2A X-3Y+Z=2B _3X+Y+Z=2C
初一数学题与代数式有关化简(a+b)(a^2-3ab=9b^2)-(a-3b)(a^2+3ab+9b^2)(x+y)^2(y+z-x)(z+x-y)+(x-y)^2(x+y+z)(x+y-z)已知z^2=x^2+y^2,化简(x+y+z)(x-y+z)(-x+y+z)(x+y-z)已知x(x-1)-(x^2-y)=-2求x^2+y^2/2-xy不需要完整的过程有2步