Question

解下列方程 2X-X=1/2-1+1/3;1/2(X-1)=2-1/5(X+2);X+2/5=X/4

Answer 1

2X-X=1/2-1+1/3
X=-1/6

1/2(X-1)=2-1/5(X+2)
1/2X-1/2=2-1/5X-2/5
1/2X+1/5X=2-2/5+1/2
7X/10=21/10
X=3

X+2/5=X/4
X-X/4=-2/5
3X/4=-2/5
X=-8/15

Answer 2

① X = -1/6

②1/2(X-1)=2-1/5(X+2)
X/2 - 1/2 = 2 - X/5 - 2/5
X/2 + X/5 = 2 - 2/5 + 1/2
7X/10 = 21/10
X = 3

③X+2/5=X/4
X - X/4 = -2/5
3X/4 = -2/5
X = -8/15

Answer 3

（1）2x-x=1/2-1+1/3 (3) x+2/5=x/4
x=-1/6 20x+8=5x
(2) 1/2(x-1)=1/5(x+2) 20x-5x=-8
5(x-1)=2((x+2) 15x=-8
5x-5=2x+4 x=-8/15
5x-2x=4+5
3x=9
x=9

Answer 4

1) X=-1/6
2) X=3
3)X=-8/15

Answer 5

2X-X=1/2-1+1/3
X=-1/6

X=3

X+2/5=X/4
X-X/4=-2/5
3X/4=-2/5
X=-8/15

Answer 6

2X-X=1/2-1+1/3 1/2(X-1)=2-1/5(X+2) X+2/5=X/4
X=-1/6 X=3 X=-8/15