2x+2y+10z=100 7x+4y=200 17x+7y+30z=400 求怎么解

来源：学生作业帮编辑：搜狗做题网作业帮分类：数学作业时间：2024/07/03 16:01:22

2x+2y+10z=100 .1
x+4y=200 .2
17x+7y+30z=400.3
由1式得
x+y+5z=50.4
3式-4式*6得
11x+y=100.5
5式*4-2式得
43x=200
x=200/43
将x=200/43代入2式得
200/43+4y=200
4y=8600/43-200/43
4y=8400/43
y=2100/43
将x=200/43,y=2100/43代入4式得
200/43+2100/43+5z=50
2300/43+5z=50
460/43+z=10
z=-30/43
所以x=200/43,y=2100/43,z=-30/43

若4x-3y-6z=0,x+2y-7z=0,求代数式5x*5x+2y*2y-z*z/2x*2x-3y*3y-10z*10 已知x+4y+z=24,2x+7y=2z=41,求x+y+z 已知2x+5y+4z=6.3x+y-7z=-4 求 x+2y+z 已知2x+5y+4z=6 3x+y-7z=-4求x+y-z 5x+3y+2z=2011 4x+6y+7z=2012 求x+y+z x*x+y*y+2z*z-2x+4y+4z+7=0,求xyz的值已知X、Y、Z满足2X-Y+4Z=8(1);X-2Y-Z=7(2)求X-Y-Z的值已知x+4y+3z=3x-2y-5z=0,求x+2y-z/2x-3y+7z的值已知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,X-2Y-Z=7,求X-Y+Z的值已知x,y,z满足2x-y+4z=8,x-2y-z=7,求x-y+z的值. 1 已知想x,y,z满足2x-y+4z=8,x-2y-z=7,求x-y+z的值