y-z=35 y-x=5 x+y+z=180 次方程怎么解呀 急!
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y-z=35y-x=5x+y+z=180次方程怎么解呀急!y-z=35y-x=5x+y+z=180次方程怎么解呀急!y-z=35y-x=5x+y+z=180次方程怎么解呀急!y-z=35,y=35+z
y-z=35 y-x=5 x+y+z=180 次方程怎么解呀 急!
y-z=35 y-x=5 x+y+z=180 次方程怎么解呀 急!
y-z=35 y-x=5 x+y+z=180 次方程怎么解呀 急!
y-z=35 ,y=35+z -------[1]
y-x=5 -------[2]
x+y+z=180 -----[3]
[1]-[2]:x-z=30,x=30+z
代入[3]:
30+z+35+z+z=180,z=115/3
x=90/3+115/3=205/3
y=105/3+115/3=215/3
y-z=35,z=y-35
y-x=5,x=y-5
x+y+z=180 ,y-5+y+y-35=180,y=220/3
z=115/3
x=205/3
y-z=35 得 y=35+z ......1
y-x=5 得 x=y-5 .......2
1,2代入x+y+z
35+z-5+35+z+z=180
z=35
y=70
x=65
z=y-35(1) x=y-5(2) 代入第三式 (y-5)+y+(y-35)=180
解方程 3y-40=180 y=220/3
代入(1) 解得z=220/3-35=115/3
代入(2) 解得x=220/3-5=205/3
(x+y-z)(x-y+z)=
X+Y+Z=?
x/y=(x+z)/(y+z)y/z=(x+y)/(x+z)
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)=?
(y+z)/x=(z+x)/y=(x+y)/z求x+y-z/x+y+z的值
x+y+z=35 2x-y=5 y/3=z/2 求x,y,z
x+y-z=3 y+z-x=5 z+x-y=7 求x,y,z
{x+y-z=11 y+z-x=5 z+x-y=1
{x+y-z=11,x-y-z=-5,x-y+z=1
x/2=y/3=z/5 x+3y-z/x-3y+z
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; y=z; z=x/y
用行列式的性质证明:y+z z+x x+y x y z x+y y+z z+x =2 z x y z+x x+y y+z y z x 这个怎么证?
X+Y+Z=15 X+5Y+10Z=70,Y.Z的值
{x:y=2:3 y:z=4:5 x+y+z=35
x:y=2:3 y:z=4:5 x+y+z=35