作业帮X+Y-Z=15 X+5Y+10Z=70 求：X、Y、Z
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X+Y-Z=15 X+5Y+10Z=70 求：X、Y、Z
X+Y-Z=15 X+5Y+10Z=70 求：X、Y、Z
X+Y-Z=15 X+5Y+10Z=70 求：X、Y、Z
x+y-z=70 *1
15x+5y+10z=70----------3x+y+2z=14 *2
*2-*1 :2x+z=-56----------z=-(2x+56)
x+y-z=x+y-[-(2x+56)]=3x+y+56=70---------3x+y=14 *3
3x+y+2z=3x+y+2[-(2x+56)]=14-----------x+y=126 *4
*3-*4 :2x=-112----------x=-56
z=56
y=182
x+y+z=15 x+5y+10z=70 x,y,z,各是几?
x+y+z=15 x+5y+10z=70 x,y,z,各是几?
X+Y-Z=15 X+5Y+10Z=70 求：X、Y、Z
X+Y+Z=15 X+5Y+10Z=70,Y.Z的值
X+Y+Z=15 X+5Y+10Z=70求X,Y和Z
方程组X+Y+Z=15,X+5Y+10Z=70求X,Y,Z
X+Y+Z=15 X+5Y+10Z=70求X,Y和Z
方程组X+Y+Z=15,X+5Y+10Z=70求X,Y,Z
10X+5Y+Z=70 X+Y+Z=1510X+5Y+Z=70 X+Y+Z=15
x+y+z=15 x+5y+10z=70 如何算
急 方程组 x+y+z=15 x+5y+10z=70
(x+y-z)(x-y+z)=
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
X+Y+Z=?
x/y=(x+z)/(y+z)y/z=(x+y)/(x+z)
x+2y+3z=23 y-z=5 x+2z=10
已知 x/(y+z)+y/(z+x)+z/(x+y)=1求 (x*x)/(y+z)+(y*y)/(x+z)+(z*z)/(x+y)=?
(4x-2y-z)-{5x-[8y-2z-(x+y)]-2(3y-10z)}=?好难啊