解方程:2-2/3X=X3/23X-(x-1)=51-38x-2/19=2-3x/33x-3x-1/4=X/63/4x-1=3x+4 2-2/3X=X3/2

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解方程:2-2/3X=X3/23X-(x-1)=51-38x-2/19=2-3x/33x-3x-1/4=X/63/4x-1=3x+4 2-2/3X=X3/2
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解方程:2-2/3X=X3/23X-(x-1)=51-38x-2/19=2-3x/33x-3x-1/4=X/63/4x-1=3x+4 2-2/3X=X3/2
解方程:2-2/3X=X3/2
3X-(x-1)=5
1-38x-2/19=2-3x/3
3x-3x-1/4=X/6
3/4x-1=3x+4
2-2/3X=X3/2

解方程:2-2/3X=X3/23X-(x-1)=51-38x-2/19=2-3x/33x-3x-1/4=X/63/4x-1=3x+4 2-2/3X=X3/2
2-2/3X=X3/2
3x/2+2/3x+2=0
3x^2/2+2x+2/3=0
9x^2+12x+4=0
(3x+2)^2=0
3x+2=0
x1=x2=-2/3
3X-(x-1)=5
3x-x+1=5
2x=4
x=2
1-38x-2/19=2-3x/3
1-38x-2/19=2-x
x-38x=1/8-1
-37x=-7/8
x=7/296
3x-3x-1/4=X/6
x/6=-1/4
x=-1/4*6
x=-8.4
3/4x-1=3x+4
3/4-x=3x^2+4x
3x^2+5x-3/4=0
12x^2+20x-3=0
万能公式解出x1、x2即可.

解: 增广矩阵(A,b) = 1 1 0 -2 -6 4 -1 -1 -1 1 3 -1 -所以方程组的通解为: (-2,-4,-5,0)'+c(1,1,2,1)' 其中c为任意

1 3x-x+1=5 2x=4 解得x=2

去问老师

1:3x=5+x-1
3x=4+x
2x=4
x=2