Question

tìm x biết a/ |x+15|+1=3x

b/|2x-5|+x=2

ai giải đc 3 tick

 

Answer 1

a. |x+15|+1=3x

=> |x+15|=3x-1

+) x+15=3x-1

=> x-3x=-1-15

=> -2x=-16

=> x=8

+) x+15=-(3x-1)

=> x+15=-3x+1

=> x+3x=1-15

=> 4x=-14

=> x=-7/2

Vậy x E {-7/2; 8}

b. |2x-5|+x=2

=> |2x-5|=2-x

+) 2x-5=2-x

=> 2x+x=2+5

=> 3x=7

=> x=7/3

+) 2x-5=-(2-x)

=> 2x-5=x-2

=> 2x-x=-2+5

=> x=3

Vậy x E {7/3; 3}.

Answer 2

a.|x+15|+1=3x

=>|x+15|=3x-1

+)x+15=3x-1

=>x-3x=-1-15

=>-2x=-16

=>x=8

+)x+15=-3x+1

=>x+3x=1-15

=>4x=-14

=>x=-7/2

Vậy:x=8 và x=-7/2

b.|2x-5|+x=2

=>|2x-5|=2-x

+)2x-5=2-x

=>2x+x=2+5

=>3x=7

=>x=7/3

+)2x-5=-2-x

=>2x+x=-2+5

=>3x=3

=>x=1

Vậy:x=7/3 và x=1.