解下二元一次方程组和三元一次方程组
问题描述:
解下二元一次方程组和三元一次方程组
写出答案即可
(1) 3m+b=11 (2)0.6x-0.4y=1.1(3)4f+g=15
-4m-b-11 0.2x-0.4y=2.3 3g-4f=-3
(4)1/2X+3Y=-6 (5)4(x-y-1)=3(1-y)-2
1/2X+Y=2 x/2+y/3=2
(6)2(x-y)/3-(x+y)/4=-1
6(x+y)-4(2x-y)=16
(7) 3x-y+z=3
2x+y-3z=11
x+y+z=12
(8) 5x-4y+4z=13
2x+7y-3z=19
3x+2y-z=18
乱了
(1) 3m+b=11 (2)0.6x-0.4y=1.1 (3)4f+g=15
···-4m-b-11·· 0.2x-0.4y=2.3 ··3g-4f=-3
(4)1/2X+3Y=-6 (5)4(x-y-1)=3(1-y)-2
··1/2X+Y=2···x/2+y/3=2
(6)2(x-y)/3-(x+y)/4=-1
···6(x+y)-4(2x-y)=16
(7) 3x-y+z=3
··2x+y-3z=11
··x+y+z=12
(8) 5x-4y+4z=13
··2x+7y-3z=19
··3x+2y-z=18
答
第一题有问题吧
(2)x=-3 y=7.25
(3)g=f=3
(4)x=12 y=-4
(5)X=2 Y=3
(6)X=Y=2
(7)X=19/9 Y=29/18 Z=-31/18
(8)X=5 Z=-3 Y=0