{2x+y+Z=10 {2x+4y+3z=9 {2x+2y+2=16{3x+2y+5z=11 {x+y+2z=8{5x+
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{2x+y+Z=10 {2x+4y+3z=9 {2x+2y+2=16{3x+2y+5z=11 {x+y+2z=8{5x+6y+7z=13
题目 应是
{2x+y+Z=10 (1)
{2x+4y+3z=9 (2)
{2x+2y+z=16 (3)
由(2)-(1)得
3y+2z=-1
由(3)-(1)得
y=6
z=-19/2
x=23
{3x+2y+5z=11 (1)
{x+y+2z=8 (2)
{5x+6y+7z=13 (3)
由(1)-(2)*2得
x+z=-5 (4)
由(3)-(2)*6得
x+5z=35 (5)
由(5)-(4)得
4z=40
z=10
x=-15
y=3
{2x+y+Z=10 (1)
{2x+4y+3z=9 (2)
{2x+2y+z=16 (3)
由(2)-(1)得
3y+2z=-1
由(3)-(1)得
y=6
z=-19/2
x=23
{3x+2y+5z=11 (1)
{x+y+2z=8 (2)
{5x+6y+7z=13 (3)
由(1)-(2)*2得
x+z=-5 (4)
由(3)-(2)*6得
x+5z=35 (5)
由(5)-(4)得
4z=40
z=10
x=-15
y=3
x/2=y/3=z/5 x+3y-z/x-3y+z
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
试证明(x+y-2z)+(y+z-2x)+(z+x-2y)=3(x+y-2z)(y+z-2x)(z+x-2y)
{2x+y+Z=10 {2x+4y+3z=9 {2x+2y+2=16{3x+2y+5z=11 {x+y+2z=8{5x+
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