解方程组:x+2y+z=10,2x+3y-z=3,3x+2y+2z=17解方程组:x+2y+z=102x+3y-z=33x+2y+2z=17这是“三元一次方程组”,明天要交!
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解方程组:x+2y+z=10,2x+3y-z=3,3x+2y+2z=17解方程组:x+2y+z=102x+3y-z=33x+2y+2z=17这是“三元一次方程组”,明天要交!
解方程组:x+2y+z=10,2x+3y-z=3,3x+2y+2z=17
解方程组:
x+2y+z=10
2x+3y-z=3
3x+2y+2z=17
这是“三元一次方程组”,明天要交!
解方程组:x+2y+z=10,2x+3y-z=3,3x+2y+2z=17解方程组:x+2y+z=102x+3y-z=33x+2y+2z=17这是“三元一次方程组”,明天要交!
x+2y+z=10(1)
2x+3y-z=3(2)
3x+2y+2z=17(3)
(1)+(2)得3x+5y=13(4)
2(2)+(3)得7x+8y=23(5)
(4)和(5)得21x+35y=91(6)
21x+24y=69(7)
(6)-(7)得11y=22,所以y=2
y=2代入(4)得y=2
x=1,y=2代入(1)得z=5
所以解得x=1,y=2,z=5
(1)+(2)得到3x+5y=13
(3)-2(1)得到x-y=-3,两边乘以5得到5x-5y=-15
以上俩式相加:8x=-2 x=-1/4
y=x+3=11/4
Z=10-x-2y=15/2
结果:X=-1/4 Y=11/4 Z=15/2
消元解之得:x为1,y为2,z为5
解三元一次方程组{2x+y=10,x-y+z=4,3x-y-z=0
解三元一次方程组方程组 -x+2y+3z 2x-2y+5z=13 3x+2y+z=10
解方程组:2x+y+z=-4 x+2y+z=-2 x+y+2z=3
解方程组 z=x+y 2x-3y+2z=5 x+2y-z=3
解方程组{z=x+y 3x-2y-2z=-5 2x+y-z=3
解方程组 x+y+z=2 x-2y+z=-1 x+2y+3z=-1
解方程组:x-2y+z=-1,x+y+z=2,x+2y+3z=-1
解方程组 :X+Y-3Z=1 Y+Z-3X=2 Z+X-3Y=3
3x-y+z=3,2x+3y-z=12,x+y+z=6解方程组
解方程组 x+y+z=5 2x-y-z=4 3x-2y-z=9
解方程组x+y+z=6 x+2y-3z=4 2x-y+z=5
方程组3x+y+2z=10,2x+3y-z=9,x+y+z=6
x+y+z+2,4x+2y+z+2,9x+3y+z=6解方程组
解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6}
解方程组{2x+3y+z=11,x+y+z=0,3x-y+z=-2.
解方程组2x+3y-z=12,3x-y+z=4,x+y+z=6
x+y-z=5,2x+3y+z=10,x-2y-z=20求方程组
解方程组x+y/2=z+x/3=y+z/4①x+y+z=27②