若-1/3x^2y^3z^m与3x^2y^3z^4是同类项m等于多少?

x.y.z.m都是有理数,并且x+y+2z=m,x+2y+3z=m,那么y与z（ ） 若x+y+z=30,3x+y-z=50,x,y,z均为非负数,且m=5x+4y+2z,试求m的最大值与最小值. 若x+y+z=30,3x+y-z=50,x,y,z均为非负数,且m=5x+4y+2z,试求m的最大值与最小值.急,求大家快点 若|x+3|+|y-2|+|2×z+1|=0求(x×z-y×z)(y-x+z)的值 若-1/3x^2y^3z^m与3x^2y^3z^4是同类项m等于多少? 若直线L:x-1/m=y+3/2=z-5/-1与平面π：x-2y+z-1=0平行,求m 若x+y+z=3y=2z,则x/x+y+z=? 设集合M={x/x=3m+1,m属于Z},N={y/y=3n+2,n属于Z},若x属于M,y属于N,则xy与集合M,N的关系 1、x+2y+z=4x+y+z=102x+3y-z=12、2x-3y+4m=113x+2y+5m=21x+3y+7m=20 四道初一计算题1、(y^2+2)^2-(y+2)(y-2)(y^2+4)2、(x+y)(y-x)-(2+y^2)(1-x)3、(m+2)(m-2)(m^2-2m+4)(m^2+2m+4)4、（x+y)(x-y)+(y-z)(y+z)+(z-x)(x+z)PS：要过程~~! 若2x+y-3z=1,3x+2y+z=5,x、y、z都是非负数,设m=3x+y-7z,求m的取值范围. 已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值 已知实数x y z满足x/(x+1)=y/(y+2)=z/(z+3)=(x+y+z)/3,求x+y+z的值 试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y) 分式加减的几道题目求速度1 .(x+y)²/（x-z)(y-z) - (y+z)²/（x-z)(y-z) = 2.2x+3y/x-y+2y/y-x-3y/x-y= 已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z 2(x+y)(x+y-z)+3(y-z)(x+y-z) 若xyz=1,求证 x^2/(y+z)+y^2/(z+x)+z^2/(x+y)≥3/2