求20个不等式组题

不要应用题哦！！

(1)

2(X-3)＜3(X+2)

(2X)/3-1≤X/2

(2)

2(X+70)＞350

70X＜7560

(3)

1000a+800a+500(10-2a)≤8000

500（10-2a)≤1000a

(4)

X+2(100-X)≤162

4A+3(100-X)≤340

(5)

n＜2/3(30-n)

n≥1/3(30-n)

(6)

2X＜5

1-（6X+2)≥-13

(7)

3(X-2)+8＞2X

(X+1)/3≥X-(X-1)/2

(8)

2X＜3

1+X＜2X

(9)

X-5≤-2

3-X＜4

(10)

6-5(X-0.2)＞-7X

3X-(10X-5)/5≥（4-2X)/2

(11)

2X+4≤0

0.5X+2＞0

(12)

2X-1＞1

0.5（X-6)＞-X

(13)

(1-X)/2＞X-2

2(X-3)≤X-8

(14)

3.5X＜5X-2

(1-X)/2＞(X-3)/3

(15)

3X+2＞X

1/3X≤2

(16)

3-5X＞X-2(2X-1)

(3X-2)/4＞2.5-X/2

(17)

2X-1＞X+1

X+8＜4X-1

(18)

5X-2＞3(X+1)

0.5X-1≤7-1.5X

(19)

2(1-3X)≤4X+1

2X-1＞3(1-3X)

(20)

91-5X)/2≥(3X+1)/3-1

3(X-1)≤5(X+1)-2

这么简单的问题也要解答

这上边有你自己下 http://www.xkb1.com/shuxue/zhongkaoshuxue/20100713/67909.html