解方程组:2x+3y+z=38,3x+4y +2z=56,4x+5y+z=66
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解方程组:2x+3y+z=38,3x+4y +2z=56,4x+5y+z=66
解方程组:2x+3y+z=38,3x+4y +2z=56,4x+5y+z=66
解方程组:2x+3y+z=38,3x+4y +2z=56,4x+5y+z=66
2x+3y+z=38——①
3x+4y +2z=56——②
4x+5y+z=66——③
③-①得2x+2y=28 x+y=14——④
2×①-② x+2y=20——⑤
⑤-④得 y=6 x=8 z=4
x=—22
y=21
z=19
(1)式加(3)式得6x+8y+2z=104 除以2得3x+4y+z=52 用(2)减得z=4
代入(3)得4x+5y=62 代入(1)得2x+3y=34 乘2得4x+6y=68 相减得y=6
代入任意一个得x=8
解方程组解方程组{y=2x-7{x+y+z=1{3x-z=4
解方程组:2x+y+z=-4 x+2y+z=-2 x+y+2z=3
解方程组{3x+y-z=4,2x-y+3z=12,x+y+z=6}
解方程组2x+3y-z=12,3x-y+z=4,x+y+z=6
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
解方程组x+y/2=z+x/3=y+z/4①x+y+z=27②
解方程组x-4y+z=-3,2x+y-z=18,x-y-z=7.
解方程组:x+y+z=4,x+y+2z=5,3x+y-z=6
x+y+z+2,4x+2y+z+2,9x+3y+z=6解方程组
解方程组:x+2y+3z=80,x/2+y/3=z/4,
解方程组x/2=y/3=z/4 ,2x+Y+Z=22
解三元一次方程组{x+y=2 y+z=3 z+x=4
x/2=y/3=z/4 x+y+z=18 求方程组解
解方程组{6x=4y=3z,2x+y+z=22
解方程组:x/2=y/3=z/4,x+y+z=18
解方程组:2x+3y+4z=20,x+y+z=7
解方程组 x:y:z=3:4:5,x+2y+z=48