Question

Answer 1

3:

a: 2x-1>3

=>2x>4

=>x>2

b: 8-4x<6

=>-4x<-2

=>x>1/2

c: 2x-1>0

=>2x>1

=>x>1/2

d: 8-4x<0

=>4x>8

=>x>2

e: x^2-5x<x^2+1

=>-5x<1

=>x>-1/5

f: 2x+1>5x-2

=>-3x>-3

=>x<1

4:

a: 1/2x-3>=0

=>1/2x>=3

=>x>=6

b: 2x^2+9>=0(luôn đúng)

c: 3x^2+12>=0(luôn đúng)

l: =>2-3x>=0

=>3x<=2

=>x<=2/3

n: =>2x+3>=0

=>2x>=-3

=>x>=-3/2

m: -2x+9>=0

=>-2x>=-9

=>x<=9/2

o: x^2>=0(luôn đúng)

p: -x^2>=0

=>x^2<=0
=>x=0

q: 3x^2>=0

=>x^2>=0(luôn đúng)