Tìm x biết: a)3/5-2/7<2/3.x+3/4<1/2+7/9

b)1/6+1/9<2/3-3/4.x<2/3+1.25

Tìm x 

a) 3/5 - 2/7 < 2/3*x +3/4 < 1 / 2 + 7/9 

b) 1/6 + 1/9 < 2/3 - 3/4*x < 2/3 + 1.25 

c) 1+ 1/3 + 1 /6 + 1/10 +........+ 2/x.(x+1) = 3992/1997

Tìm x biết:a) 10/x = -15/9; b) x/9 = -11/5 : 0,6; c) -7/8 - 2x = -3/4; d) (x-1/2):1/3+5/7=9và5/7; e)1/15.x+4/5.x=5và1/5; f) -1/3<x/6<1/2(x thuộc Z); h) 3/5+2/5:x=-1/4;i) 4 và 3/4x - 3 và 1/2=5/4; k)9/4.(1/3x-1/2)=4và1/2

1, √x^2-5x+8<=3x-10

2, x^2-4x+3/3-2x<1-x

3, |x^2+x-2|+3x^2-3>0

4, |x+3|>=2(1+x^2)

5, |x^2-1|>x^2+2x-3

6, |2x-1|<x+2

7, 3/2-x<=1

8, 2+3x-x^2<=√4+3x-x^2

9, √x^2-5x+6<5-x

10, x^2-6>5(x+√x^2-5x)

11, |x^2-x|<=x^2-x

1, √x^2-5x+8<=3x-10

2, x^2-4x+3/3-2x<1-x

3, |x^2+x-2|+3x^2-3>0

4, |x+3|>=2(1+x^2)

5, |x^2-1|>x^2+2x-3

6, |2x-1|<x+2

7, 3/2-x<=1

8, 2+3x-x^2<=√4+3x-x^2

9, √x^2-5x+6<5-x

10, x^2-6>5(x+√x^2-5x)

11, |x^2-x|<=x^2-x

1, √x^2-5x+8<=3x-10

2, x^2-4x+3/3-2x<1-x

3, |x^2+x-2|+3x^2-3>0

4, |x+3|>=2(1+x^2)

5, |x^2-1|>x^2+2x-3

6, |2x-1|<x+2

7, 3/2-x<=1

8, 2+3x-x^2<=√4+3x-x^2

9, √x^2-5x+6<5-x

10, x^2-6>5(x+√x^2-5x)

11, |x^2-x|<=x^2-x

1, √x^2-5x+8<=3x-10

2, x^2-4x+3/3-2x<1-x

3, |x^2+x-2|+3x^2-3>0

4, |x+3|>=2(1+x^2)

5, |x^2-1|>x^2+2x-3

6, |2x-1|<x+2

7, 3/2-x<=1

8, 2+3x-x^2<=√4+3x-x^2

9, √x^2-5x+6<5-x

10, x^2-6>5(x+√x^2-5x)

11, |x^2-x|<=x^2-x

A  giải các bất phương trình sau:
1, (x+4)/5 - x + 5 < (x+3)/3- (x-2)/2
2, (x+27)/5 - (3x-7)/4 >0

3, (7-8x)/(x^2+1) >0
4, (2x+1)/5 - (2x-2)/3 < 1

5, 1/(x+2) < 1/(x-2)
6, (x-2)/(x-5) - 3/(x-1) < 1
7, x + 6/x < 7
8, (3x-5)/x bé hơn hoặc bằng 2
9, (2x+1)/(x+1) bé hơn hoặc bằng 1

tìm x thuộc Z 

a) 1/3 + (-2)/5 + 1/6 + (-1)/5 < x < ( -3)/4 + 2/7 + (-1)/4 + 3/5 + 5/7

b) 5/17 + (-4)/9 + (-20)/31 + 12/17 + (-11)/31 < x/9 < (-3)/7 + 7/15 + 4/(-7) + 8/15 +2/3