已知X+2Y-Z=8,2X-Y+Z=18,则8X+Y+Z=
来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/26 16:00:25
已知X+2Y-Z=8,2X-Y+Z=18,则8X+Y+Z=已知X+2Y-Z=8,2X-Y+Z=18,则8X+Y+Z=已知X+2Y-Z=8,2X-Y+Z=18,则8X+Y+Z=由X+2Y-Z=8得2X+
已知X+2Y-Z=8,2X-Y+Z=18,则8X+Y+Z=
已知X+2Y-Z=8,2X-Y+Z=18,则8X+Y+Z=
已知X+2Y-Z=8,2X-Y+Z=18,则8X+Y+Z=
由X+2Y-Z=8 得2X+4Y-Z=16(等式两边同时乘以2) 由2X-Y+Z=18得6X-3Y+3Z=54(同时乘以3) 以上两式相加得8X+Y+Z=70
结果是:70 2X-Y+Z=18这个等式的两边各乘以2得到4X-2Y+2Z=36 这个等式和X+2Y-Z=8左右两边各相加得到5X+Z=44 X+2Y-Z=8和2X-Y+Z=18左右两边各相加得到3X+Y=26,所以5X+Z+3X+Y=8X+Y+Z=44+26=70
已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..
已知(x+y)(x+z)=x,(y+z)(y+x)=2y,(z+x)(z+y)=3z,求x,y,z
已知:x^2/(z+y)+y^2/(x+z)+z^2/(x+y)=0,求x/(z+y)+y/(x+z)+z/(x+y)的值.
已知X+2Y-Z=8,2X-Y+Z=18,则8X+Y+Z=
已知x+2y-z=8,2x-y+z=18 ,求8X+Y-Z的值
已知(x+y+z)^2=x^2+y^2+z^2,证明x(y+z)+y(z+x)+z(x+y)=0
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x、y、z满足方程组:x+y-z=6;y+z-x=2;z+x-y=0 求x、y、z的值
已知X.Y.Z满足方程组,X+y-Z=6y+z-x=2z+x-y=0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
代数式化简已知z^2=x^2+y^2化简:(x+y+z)(x-y+z)(-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,y,z 大于0,x+y+z=2,求证 xz/y(y+z)+zy/x(x+y)+yx/z(z+x)大于等于2/3
已知关于x y z的方程组2x-3y+5z=7 x+2y-3z=8,则4x+y-z=
已知x,y,z满足2x-y+4z=8,x-2y-z=7,求x-y+z的值.要2种方法
已知X、Y、Z满足2X-Y+4Z=8(1);X-2Y-Z=7(2)求X-Y-Z的值
已知4x-3y+z=0,x+2y-8z=0,xyz不等于0,求x+y-z/x-y+2z的值
已知:X、Y、Z满足2X-Y+4Z=8,X-2Y-Z=7,求X-Y+Z的值